AmTrust Financial Services (AFSIP) 10-Q 9 Nov 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Nov. 01, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	AFSI
Entity Registrant Name	AMTRUST FINANCIAL SERVICES, INC.
Entity Central Index Key	1,365,555
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		197,701,263

Consolidated Balance Sheets (un

Consolidated Balance Sheets (unaudited) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Investments:
Fixed maturity securities, available-for-sale, at fair value (amortized cost $8,636.0; and $7,408.7)		$ 8,496.7	$ 7,488.3
Fixed maturity securities, trading, at fair value (amortized cost $3.7; and $52.2)		3.2	49.8
Equity securities, at fair value (cost $123.2; and $195.9)	[1]	139.3	211.7
Short-term investments		198	187.8
Other investments (related party $239.4; and $56.6)		414.9	212
Total investments		9,252.1	8,149.6
Cash and cash equivalents		554.9	763.1
Restricted cash and cash equivalents		439	480.1
Accrued interest and dividends		67.2	64.4
Premiums receivable, net (related party $195.7; and $0)		3,007.2	2,784.8
Reinsurance recoverable (related party $3,648.4; and $3,026.8)		6,129.7	6,131.4
Prepaid reinsurance premiums (related party $1,213.8; and $1,172.3)		2,292.6	2,137.3
Federal income tax receivable		76.8	73.9
Deferred policy acquisition costs		983.6	922.9
Assets held for sale		0	900.9
Property and equipment, net		405.9	453.4
Goodwill		528.4	552.9
Intangible assets		326.1	380.8
Other assets (related party $198.4; and $271.4; recorded at fair value $1.9; and $20.8)		1,626.4	1,423.1
Total assets		25,689.9	25,218.6
Liabilities:
Loss and loss adjustment expense reserves		12,551.2	12,138.8
Unearned premiums		5,660.8	5,279.2
Ceded reinsurance premiums payable (related party $396.0; and $402.4)		894.8	809.6
Funds held under reinsurance treaties		65.1	83.6
Note payable on collateral loan – related party		168	168
Securities sold but not yet purchased, at fair value		33.1	75.5
Securities sold under agreements to repurchase		233.8	0
Liabilities held for sale		0	761.7
Deferred gain on retroactive reinsurance		311.3	330
Debt (net of debt issuance cost of $14.9, and $15.0)		1,325	1,288.7
Accrued expenses and other liabilities (related party $74.9; and $0; recorded at fair value $28.7; and $78.6)		987.6	913.5
Total liabilities		22,230.7	21,848.6
Commitments and contingencies
Redeemable non-controlling interest		0	1.9
Stockholders’ equity:
Common stock, $0.01 par value; 500.0 shares authorized; 210.8 issued in 2018 and 2017; 197.7 and 196.1 outstanding in 2018 and 2017, respectively		2.1	2.1
Preferred stock, $0.01 par value; 10.0 shares authorized; 5.4 issued and outstanding in 2018 and 2017; $913.7 aggregated liquidation preference in 2018 and 2017		913.7	913.7
Additional paid-in capital		1,627.7	1,639.6
Treasury stock at cost; 13.1 and 14.7 shares in 2018 and 2017, respectively		(215.9)	(242.1)
Accumulated other comprehensive (loss) income, net of tax		(212.4)	15.5
Retained earnings		1,289.3	860.9
Total AmTrust Financial Services, Inc. equity		3,404.5	3,189.7
Non-controlling interest		54.7	178.4
Total stockholders’ equity		3,459.2	3,368.1
Total liabilities and stockholders' equity		$ 25,689.9	$ 25,218.6
[1]	In connection with the adoption of ASU 2016-01, the consolidated balance sheets as of December 31, 2017 have been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the adoption of ASU 2016-01.

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (unaudited) (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fixed maturity securities, available-for-sale, amortized costs	$ 8,636	$ 7,408.7
Fixed maturities, trading, amortized cost	3.7	52.2
Equity securities, cost	123.2	195.9
Other investments	414.9	212
Reinsurance recoverable	6,129.7	6,131.4
Premiums receivable, net	3,007.2	2,784.8
Prepaid reinsurance premium	2,292.6	2,137.3
Other assets	1,626.4	1,423.1
Other assets, fair value	1.9	20.8
Ceded reinsurance premiums payable	894.8	809.6
Debt issuance costs	14.9	15
Accrued expenses and other liabilities	987.6	913.5
Accrued expenses and other liabilities, fair value	$ 28.7	$ 78.6
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, issued (in shares)	210,800,000	210,800,000
Common stock, outstanding (in shares)	197,700,000	196,100,000
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	5,400,000	5,400,000
Preferred stock, shares outstanding (in shares)	5,400,000	5,400,000
Liquidation preference	$ 913.7	$ 913.7
Treasury stock at cost (in shares)	13,100,000	14,700,000
Related Party Transactions
Other investments	$ 239.4	$ 56.6
Reinsurance recoverable	3,648.4	3,026.8
Premiums receivable, net	195.7	0
Prepaid reinsurance premium	1,213.8	1,172.3
Other assets	198.4	271.4
Ceded reinsurance premiums payable	396	402.4
Accrued expenses and other liabilities	$ 74.9	$ 0

Consolidated Statements of Oper

Consolidated Statements of Operations (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Net earned premium	$ 1,425.2	$ 1,192.9	$ 4,066.3	$ 3,796.1
Service and fee income (related parties - three months $13.7; $25.3 and nine months $40.9; $81.2)	52.5	180.5	217.9	486.4
Net investment income	69.8	61.1	206.3	173.7
Net realized gain on investments	15.6	24.5	23.3	56.6
(Loss) gain on sales of U.S.-based fee businesses	(7.8)	0	716.3	0
Other	7.4	185.9	12.6	193.1
Total revenues	1,562.7	1,644.9	5,242.7	4,705.9
Losses and expenses:
Loss and loss adjustment expenses	1,063.2	1,266.1	2,969.8	3,130.9
Amortization of deferred acquisition costs (net of ceding commission - related party - three months $141.5; $138.6 and nine months $456.3; $455.9)	297.7	169.2	819.6	587.7
Underwriting, general and administrative expenses	171	167.9	508.8	450.8
Interest expense (net of interest income - related party - three months $1.2; $1.2 and nine months $3.5; $3.5)	22.9	22.9	67.6	70.7
Foreign currency (gain) loss	(14)	62.8	(28.9)	139.7
Other	82.4	177.4	406.3	540.1
Total losses and expenses	1,623.2	1,866.3	4,743.2	4,919.9
(Loss) income before income taxes and equity in earnings of unconsolidated subsidiaries	(60.5)	(221.4)	499.5	(214)
Benefit from income taxes	(21.5)	(62.6)	(40.5)	(61)
(Loss) income before equity in earnings of unconsolidated subsidiaries	(39)	(158.8)	540	(153)
Equity in (loss) earnings of unconsolidated subsidiaries	(31.7)	0	(31.7)	73.5
Net (loss) income	(70.7)	(158.8)	508.3	(79.5)
Net loss (income) attributable to non-controlling interest and redeemable non-controlling interest of subsidiaries	2.8	0.7	2.5	(17)
Net (loss) income attributable to AmTrust stockholders	(67.9)	(158.1)	510.8	(96.5)
Dividends on preferred stock	(16.6)	(16.6)	(49.7)	(49.7)
Net (loss) income attributable to AmTrust common stockholders	$ (84.5)	$ (174.7)	$ 461.1	$ (146.2)
Earnings per common share: (usd per share)
Basic (loss) earnings per share (usd per share)	$ (0.43)	$ (0.89)	$ 2.34	$ (0.80)
Diluted (loss) earnings per share (usd per share)	$ (0.43)	$ (0.89)	$ 2.34	$ (0.80)

Consolidated Statements of Inco

Consolidated Statements of Income (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Service and fee income	$ 52.5	$ 180.5	$ 217.9	$ 486.4
Interest Income form related party	1.2	1.2	3.5	3.5
Related Party Transactions
Service and fee income	13.7	25.3	40.9	81.2
Ceding commission - earned	$ 141.5	$ 138.6	$ 456.3	$ 455.9

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income (unaudited) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) income		$ (70.7)	$ (158.8)	$ 508.3	$ (79.5)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments		(29)	50.6	(53.4)	127.2
Change in fair value of interest rate swap		0	0.1	0	0.2
Unrealized (loss) gain on debt securities:
Gross unrealized holding (loss) gain		(24.9)	17.1	(199.8)	115.2
Less tax (benefit) expense		(8)	(2.7)	(46)	20.3
Cumulative effect of change in accounting principles, net of taxes of $20.4 for the nine months ended September 30, 2018	[1]	0	0	(0.7)	0
Net unrealized holding (loss) gain		(16.9)	19.8	(154.5)	94.9
Other net realized gain on investments		(15.9)	(23.3)	(20)	(54.2)
Reclassification adjustment for investment gain included in net (loss)		(15.9)	(23.3)	(20)	(54.2)
Other comprehensive (loss) income, net of tax		(61.8)	47.2	(227.9)	168.1
Comprehensive (loss) income		(132.5)	(111.6)	280.4	88.6
Less: Comprehensive (loss) income attributable to non-controlling and redeemable non-controlling interest		(2.8)	(0.7)	(2.5)	17
Comprehensive (loss) income attributable to AmTrust Financial Services, Inc.		$ (129.7)	$ (110.9)	$ 282.9	$ 71.6
[1]	See Note 2. "Recent Accounting Pronouncements" for additional information on the adoptions of ASU 2016-01 and ASU 2018-02.

Consolidated Statement of Com_2

Consolidated Statement of Comprehensive Income (unaudited) (Parenthetical) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Statement of Comprehensive Income [Abstract]
Cumulative effect of change in accounting principles, taxes	$ 20.4

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	[1]
Statement of Cash Flows [Abstract]
Net cash provided by (used in) operating activities		$ 359.7	$ (74.2)
Purchases of:
Fixed maturity securities, available-for-sale		(3,152.6)	(1,603.9)
Fixed maturity securities, trading		(404.6)	(386.6)
Equity securities		(167)	(51.4)
Other investments		(18.1)	(18.8)
Subsidiaries, net of cash received		0.1	(97.8)
Property, equipment and software, net		(2)	(193.2)
Life settlement contracts		0	(16.5)
Sales of:
Fixed maturity securities, available-for-sale (includes maturities & paydowns)		1,842.9	1,704.2
Fixed maturity securities, trading		448.5	379.9
Equity securities		252.5	193.5
Other investments		4.7	50.8
Life settlement contracts		0	90
Policy management system		0	57
Securities sold but not purchased, net		(42.6)	19.8
Equity method investment		0	211.3
Subsidiary, net of cash transferred	[2]	535.6	0
Short term investments, net		9.2	(7.3)
Receipt of life settlement contract proceeds		0	48.7
Net cash (used in) provided by investing activities		(693.4)	379.7
Cash flows from financing activities:
Securities sold under agreements to repurchase, net		233.8	(160.3)
Secured loan agreements borrowings		26.2	108.2
Secured loan agreements payments		(11.4)	(9.3)
Promissory notes payments		0	(52.3)
Common stock issuance		0	298.7
Contingent consideration payments		(1.4)	(16.6)
Non-controlling interest capital dividends from consolidated subsidiaries, net		(114.6)	(31.4)
Stock option exercises and other		(2.6)	0.3
Dividends distributed on common stock		(66.7)	(91.4)
Dividends distributed on preferred stock		(49.7)	(49.7)
Net cash provided by (used in) financing activities		13.6	(3.8)
Effect of exchange rate changes on cash		(19.1)	62.8
Cash, cash equivalents and restricted cash included in business classified as held for sale, beginning of the year		89.9	0
Net (decrease) increase in cash, cash equivalents and restricted cash and restricted cash equivalents		(249.3)	364.5
Cash, cash equivalents, restricted cash and restricted cash equivalents, beginning of the year		1,243.2	1,281.1
Cash, cash equivalents, restricted cash and restricted cash equivalents, end of the period		$ 993.9	$ 1,645.6
[1]	In connection with the adoption of ASU 2016-18, the disclosure for the nine months ended September 30, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the adoption of ASU 2016-18.
[2]	Relates to the transfer of our U.S.-based fee business. See Note 13. "Divestitures" for additional information.

Basis of Reporting and Merger A

Basis of Reporting and Merger Agreement	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Reporting and Merger Agreement	Basis of Reporting and Merger Agreement Basis of Reporting The accompanying unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial statements and with the instructions to Form 10-Q and Article 10 of Regulation S-X and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. These interim statements should be read in conjunction with the consolidated financial statements and notes thereto included in the AmTrust Financial Services, Inc. (“AmTrust” or the “Company”) Annual Report on Form 10-K for the year ended December 31, 2017 , previously filed with the Securities and Exchange Commission ("SEC") on March 16, 2018 ("Form 10-K"). These interim consolidated financial statements reflect all adjustments that are, in the opinion of management, necessary for a fair presentation of the results for the interim period and all such adjustments are of a normal recurring nature. The results of operations for the interim period are not necessarily indicative, if annualized, of those to be expected for the full year. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. A detailed description of the Company’s significant accounting policies and management judgments is located in the audited consolidated financial statements for the year ended December 31, 2017 , included in the Company’s Form 10-K filed with the SEC. All material inter-company transactions and accounts have been eliminated in the consolidated financial statements. To facilitate period-to-period comparisons, certain reclassifications have been made to prior period consolidated financial statement amounts to conform to current period presentation. Merger Agreement On March 1, 2018, the Company entered into an agreement and plan of merger with Evergreen Parent, L.P. (“Evergreen Parent”), an entity formed by private equity funds managed by Stone Point Capital LLC (“Stone Point”), together with Barry D. Zyskind, the Company’s Chairman and CEO, George Karfunkel and Leah Karfunkel (such individuals, collectively, the “Karfunkel-Zyskind Family”) pursuant to which Evergreen Parent will acquire all of the Company’s outstanding common shares, par value $0.01 per share (the “Common Stock”) that are not currently owned or controlled by the Karfunkel-Zyskind Family and its affiliates and certain related parties (the “Merger Agreement”). The Karfunkel-Zyskind Family and its affiliates and certain related parties currently own or control approximately 55% of the Company's outstanding shares of Common Stock. On June 6, 2018, the parties entered into Amendment No. 1 to the Merger Agreement (the “Amended Merger Agreement”). Pursuant to the transactions contemplated by the Amended Merger Agreement, at the effective time of the merger, each outstanding share of the Company’s Common Stock (other than certain excluded shares) will be converted into the right to receive $14.75 per share of Common Stock in cash, without interest and less any required withholding taxes (the “Merger Consideration”). Common Stock owned by the Company, any wholly-owned subsidiary of the Company, a subsidiary formed to participate in the merger, Evergreen Parent (including the Rollover Shares (as defined below)) or holders who have properly exercised dissenters’ rights under Delaware law will not be converted into the right to receive the Merger Consideration. On June 21, 2018, the Amended Merger Agreement was adopted by the affirmative vote of (i) the holders of at least a majority of all outstanding shares of Common Stock and (ii) the holders of at least a majority of all outstanding shares of Common Stock held by the “Public Stockholders” (defined as stockholders other than Evergreen Parent and its affiliates, the Rollover Stockholders (as defined below) and their respective affiliates and certain related parties and the Company’s directors and officers as set forth on Schedule I to the Merger Agreement), in each case, entitled to vote on the merger at a meeting of stockholders duly called and held for such purpose (the “Requisite Stockholder Vote”). Consummation of the merger remains subject to certain customary closing conditions, including regulatory approvals. The Amended Merger Agreement contains customary termination rights for the Company and Evergreen Parent, which were described in the Company’s Current Report on Form 8-K filed with the SEC on March 1, 2018 and its Current Report on Form 8-K filed with the SEC on June 7, 2018. The Amended Merger Agreement also contains customary representations, warranties and covenants of the Company, including covenants to conduct its business in the ordinary course during the interim period between the execution of the Amended Merger Agreement and consummation of the merger and not to engage in certain types of transactions during this interim period without the prior written consent of Evergreen Parent. Evergreen Parent has obtained equity financing commitments for the transactions contemplated by the Amended Merger Agreement, the aggregate proceeds of which, when combined with available cash resources of the Company, will be sufficient for Evergreen Parent to pay the aggregate Merger Consideration and all related fees and expenses. On March 1, 2018, private equity funds managed by Stone Point and an investment entity controlled by the Karfunkel-Zyskind Family committed to capitalize Evergreen Parent, at or immediately prior to the effective time of the merger, with an aggregate equity contribution in an amount up to $800.0 and $400.0 , respectively, in exchange for equity interests in Evergreen Parent, subject to the terms and conditions set forth in certain equity financing commitment letters, dated as of March 1, 2018. On July 23, 2018, Evergreen Parent entered into subscription agreements, subject to certain conditions, with Enstar Group Limited (“Enstar”), an entity controlled by Madison Dearborn Partners (“MDP”), and for certain limited purposes, a private equity fund controlled by Stone Point and the investment entity controlled by the Karfunkel-Zyskind Family, pursuant to which Enstar and MDP agreed to purchase equity in Evergreen Parent in an aggregate amount of $200.0 and $150.0 , respectively. This aggregate amount of equity financing provided to Evergreen Parent by Enstar and MDP will reduce, pro rata, the aggregate amount of equity financing provided to Evergreen Parent by the private equity funds managed by Stone Point and the investment entity controlled by the Karfunkel-Zyskind Family. In addition, the Karfunkel-Zyskind Family and its affiliates and certain related parties (the “Rollover Stockholders”) entered into a rollover agreement, dated as of March 1, 2018, pursuant to which such Rollover Stockholders committed to contribute all of the shares of Common Stock that they own to Evergreen Parent immediately prior to the closing of the merger (the “Rollover Shares”).

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements As compared to those described in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2017 , the Company's significant accounting policies have been updated for the recent accounting pronouncements or changes in accounting pronouncements discussed below during the nine months ended September 30, 2018 . Recent Accounting Standards, Adopted In February 2018, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income . The amendments allow an entity to elect to reclassify the income tax effects of the United States of America ("U.S.") federal government enacted tax bill, the Tax Cuts and Jobs Act ("TCJA"), on items within accumulated other comprehensive income to retained earnings. If an entity elects to reclassify the income tax effects, the amount of that reclassification only includes the effect of the change in the U.S. federal corporate income tax rate on the gross deferred tax amounts and related valuation allowances, if any, at the date of enactment related to items remaining in accumulated other comprehensive income. An entity is not permitted to reclassify the effect of the change in the U.S. federal corporate income tax rate on gross valuation allowances that were originally charged to income from operations. An entity is required to disclose a description of the accounting policy for releasing income tax effects from accumulated other comprehensive income. An entity is permitted to apply the guidance either at the beginning of the period of adoption or retrospectively to each period (or periods) in which the income tax effects of the TCJA are recognized. This guidance is effective for fiscal years beginning after December 15, 2018, including interim reporting periods within that reporting period. Early adoption is permitted, including adoption in any interim period. The Company adopted the guidance early on January 1, 2018. The cumulative effect was an increase to accumulated other comprehensive income and a decrease to retained earnings of $16.0 . In February 2017, the FASB issued ASU 2017-05, Other Income-Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets, which clarifies that ASC 610-20 applies to the derecognition of nonfinancial assets and in substance nonfinancial assets unless other specific guidance applies. As a result, the new guidance does not apply to the derecognition of businesses, nonprofit activities, or financial assets (including equity method investments), or to certain revenue transactions accounted for as revenue from contracts with customers. The new guidance also clarifies that an in substance nonfinancial asset is an asset or group of assets for which substantially all of the fair value consists of nonfinancial assets and the group or subsidiary is not a business. In addition, transfers of nonfinancial assets to another entity in exchange for a noncontrolling ownership interest in that entity is accounted for under ASC 610-20, and the specific guidance on such partial exchanges from ASC 845, Nonmonetary Transactions is eliminated. As a result of the new guidance, the guidance specific to real estate sales in ASC 360-20, Property, Plant, and Equipment-Real Estate Sales is eliminated. As such, sales and partial sales of real estate assets are subject to the same derecognition model as all other nonfinancial assets. The Company adopted this guidance on a modified retrospective basis. The adoption of this guidance on January 1, 2018 did not have a material effect on the Company's financial position, results of operations or cash flows. In October 2016, the FASB issued ASU 2016-16, Accounting for Income Taxes: Intra-Entity Asset Transfers of Assets Other than Inventory . The ASU is part of the FASB’s simplification initiative aimed at reducing complexity in accounting standards. The new guidance eliminates the exception for all intra-entity sales of assets other than inventory. As a result, a reporting entity recognizes the tax expense from the sale of the asset in the seller’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of that transaction are eliminated in consolidation. Any deferred tax asset that arises in the buyer’s jurisdiction is also recognized at the time of the transfer. The adoption of this guidance on January 1, 2018 did not have a material effect on the Company's financial position, results of operations or cash flows. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments . The amendments provide guidance and clarification for eight specific cash flow issues, which include debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate and bank owned life insurance policies, distributions received from equity-method investees, beneficial interests in securitization transactions, and separately identifiable cash flows and application of the predominance principle. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230) - Restricted Cash, which provides guidance on the presentation of restricted cash and restricted cash equivalents in the statement of cash flows. As a result, amounts generally described as restricted cash and restricted cash equivalents are required to be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts presented on the statement of cash flows. An entity is required to disclose the amounts of cash, cash equivalents, and restricted cash, disaggregated by related captions within the balance sheet, reconciled to the total amount cash, cash equivalents, and restricted cash presented in the statement of cash flows, and to disclose information on the nature of restrictions on its cash, cash equivalents, and restricted cash. The Company adopted both ASUs on January 1, 2018 using a retrospective transition method to each period presented. In January 2016, the FASB issued ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , which address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. Specifically, the guidance (a) requires equity investments to be measured at fair value with changes in fair value recognized in earnings. However, an entity may elect to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulted from observable price changes in orderly transactions for identical or similar investments of the same issuer, (b) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment, (c) eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost, (d) requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes, (e) requires an entity to present separately in other comprehensive income the portion of the total change in fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option, (f) requires separate presentation of financial assets and liabilities by measurement category and form on the balance sheet or the notes to the financial statements, and (g) clarifies that the need for a valuation allowance on a deferred tax asset related to an available for sale security should be evaluated with other deferred tax assets. The Company adopted the guidance on January 1, 2018. The cumulative effect was a decrease to accumulated other comprehensive income and an increase to retained earnings of $16.7 . The Company elected to measure its equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for identical or similar investments of the same issuer, and applied the prospective transition method. In May 2014, the FASB issued ASU 2014-09, Revenue From Contracts With Customers . The new standard supersedes the revenue recognition requirements in Topic 605, Revenue Recognition , and eliminates industry-specific guidance. The core principle of the new standard is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve the core principle, an entity should apply the following steps: identify the contract with a customer, identify the performance obligations in the contract, determine the transaction price, allocate the transaction price to the performance obligations in the contract, and recognize revenue when (or as) the entity satisfies a performance obligation. The new standard requires variable consideration to be estimated as part of the determination of the transaction price of a contract subject to a constraint based on a probability assessment of revenue reversal. The new standard also requires certain incremental costs incurred to obtain or fulfill a contract to be deferred and amortized on a systematic basis consistent with the transfer of goods or services to the customer. The guidance also requires additional disclosures about the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts, including significant judgments and changes in judgments in determining the timing of satisfaction of performance obligations (over time or at a point in time), determining transaction price and amounts allocated to performance obligations, and assets recognized from the costs incurred to obtain or fulfill a contract. ASU 2014-09 does not apply to insurance contracts, leases, financial instruments, and certain other agreements that are within the scope of other GAAP guidance. The Company adopted the standard on January 1, 2018 using the modified retrospective method. The adoption of this guidance on January 1, 2018 did not have a material effect on the Company's financial position, results of operations or cash flows. As a provider of property and casualty insurance products, the Company’s insurance contracts are accounted for as insurance which is not effected by the accounting policy changes. The accounting policy changes are applied to the Company’s contracts with customers related to the performance of services with no underlying insurance risk. The financial statement information reported for comparable prior periods is not adjusted for the accounting policy changes, and is reported in accordance with the accounting standards in effect under Topic 605, Revenue Recognition in accordance with the modified retrospective transition method applied under ASU 2014-09. For the three and nine months ended September 30, 2018 , approximately $39.9 and $196.8 , respectively, of revenues, or less than 5% of the Company's total revenues, are affected by the accounting policy changes. Refer to Note 12. "Segments" for disclosure of revenues from contracts with customers by business segment. On February 28, 2018, the Company completed the transfer of a majority interest in the portion of the Company's U.S.-based fee businesses that (a) act as managing general agents for the distribution, underwriting and procurement of property and casualty insurance on behalf of certain of the Company's affiliates and other insurance carriers and (b) design, develop, market and act as third party administrators for programs for service contracts, limited warranties and replacement plans as further described in the Acquisition Agreement (the “U.S.-based fee business”), that reduces service and fee income subsequent to the transfer date. The Company’s revenues related to services provided to customers include, (i) product warranty registration and service, (ii) insurance-related services, broker and agency services, claims administration, management services, loss control and risk management services, and (iii) asset management services and other business services. The Company’s broker and commission revenues are recognized at the point in time when the insurance or reinsurance is effective and the Company has the right to receive contract consideration, net of an adjustment for cancellations. The Company’s revenues from the other services are recognized on a pro rata basis over the contract service periods by allocating estimated contract consideration to the performance obligations which are satisfied as the services are provided and transferred to its customers. The contract consideration amounts received or receivable at inception of the contract service periods are recognized as deferred revenue. The Company defers the incremental costs of obtaining contracts with customers and amortizes those costs over the contract service periods as services are transferred to the customers. The incremental costs incurred to obtain and fulfill contracts with customers are deferred when the costs a) relate directly to a specific contract or anticipated contract, b) generate or enhance resources that the Company will use in satisfying the performance obligation, and c) are expected to be recovered. Subsequent to the transfer of the U.S.-based fee business on February 28, 2018, the deferred contract costs are not significant. The Company expenses the incremental costs of obtaining contracts with customers as incurred if the amortization period of the asset that otherwise would have been recognized is one year or less as a permitted practical expedient. Recent Accounting Standards, Not Yet Adopted In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract that aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software and hosting arrangements that include an internal-use software license. The amendments require a customer in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. The amendments also require the customer to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. The accounting for the service element of a hosting arrangement that is a service contract is not affected by this ASU. The amendments also require the capitalized implementation costs to be evaluated for impairment under the existing impairment guidance for long-lived assets. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted, including adoption in any interim period. The guidance is applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is currently evaluating the impact the amendments may have on its financial position, results of operations or cash flows. In March 2017, the FASB issued ASU 2017-08, Receivables-Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities . The new guidance shortens the amortization period for the premium on callable debt securities to the earliest call date. The amortization period for the discount on callable debt securities is not changed by the new guidance, and continues to be amortized to maturity. The new guidance more closely aligns interest income recorded on debt securities held at a premium or a discount with the economics of the underlying instrument. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within that reporting period. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the guidance in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company is currently evaluating the impact the amendments may have on its financial position, results of operations or cash flows. In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment , which simplifies the accounting for goodwill impairment charges. Under the current guidance, if the fair value of a reporting unit is lower than its carrying amount, an entity calculates any impairment charge by comparing the implied fair value of goodwill with its carrying amount. The implied fair value of goodwill is calculated by deducting the fair value of all assets and liabilities of the reporting unit from the reporting unit’s fair value. Under the new guidance, an entity will record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value not to exceed the amount of goodwill allocated to that reporting unit. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within that reporting period. Early adoption is permitted for annual and interim goodwill impairment testing dates after January 1, 2017. The Company is currently evaluating the impact the amendments may have on its financial position, results of operations or cash flows. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . The new standard requires financial assets measured at amortized cost basis to be presented at the net amount expected to be collected by recording an allowance for credit losses, presented as a deduction from the amortized cost basis, with changes in the allowance recorded as credit loss expense based on management's current estimate of expected credit losses each period. The new standard also requires impairment relating to credit losses on available-for-sale debt securities to be presented through an allowance for credit losses with changes in the allowance recorded in the period of the change as credit loss expense or reversal of credit loss expense. Any impairment amount not recorded through an allowance for credit losses on available-for-sale debt securities is recorded through other comprehensive income. The new standard is effective for fiscal years beginning after December 15, 2019, including interim reporting periods within that reporting period. The Company is currently evaluating the impact the new standard may have on its financial position, results of operations or cash flows. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The new standard amends the guidance for leasing transactions. The guidance requires a lessee to classify lease contracts as finance or operating leases, and to recognize assets and liabilities for the rights and obligations created by leasing transactions with lease terms more than twelve months. The guidance substantially retains the criteria for classifying leasing transactions as finance or operating leases. For finance leases, a lessee recognizes a right-of-use asset and a lease liability initially measured at the present value of the lease payments, and recognizes interest expense on the lease liability separately from the amortization of the right-of-use asset. For operating leases, a lessee recognizes a right-of-use asset and a lease liability initially measured at the present value of the lease payments, and recognizes lease expense on a straight-line basis. The guidance requires a lessor to recognize lease income related to an operating lease generally on a straight-line basis over the lease term. Lessees and lessors are required to disclose qualitative and quantitative information about leasing arrangements to enable a user of the financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. In January 2018, the FASB issued ASU 2018-01, Land Easement Practical Expedient for Transition to Topic 842 that provides a lessee or lessor the election to not assess whether land easements, not currently accounted for as leases under the current lease guidance, are leases under the new standard. On a prospective basis after adoption of the guidance, a lessee or lessor is required to apply the new standard to new or modified land easements. In July 2018, the FASB issued ASU 2018-11, Targeted Improvements that permits the initial application of the new standard as of the effective date and the recognition of a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. ASU 2018-11 also provides lessors with an option, by class of underlying asset, to not separate nonlease components from the related lease component and, instead, to account for those components as a single component subject to certain criteria. The new standard is effective for fiscal years beginning after December 15, 2018, including interim periods within that period. Early adoption is permitted. The Company is implementing changes to its enterprise reporting systems and its processes in conjunction with the evaluation of the new standard on the existing lease agreements. The Company plans to adopt the new standard as of January 1, 2019, and to recognize any cumulative-effect adjustment to the opening balance of retained earnings as of the date of adoption. The Company is currently evaluating the impact the new standard may have on its financial position, results of operations or cash flows.

Investments

Investments	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investments	Investments (a) Available-for-Sale Securities The amortized cost, gross unrealized gains and losses, and estimated fair value of securities classified as available-for-sale as of September 30, 2018 and December 31, 2017 , are presented below: As of September 30, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. treasury securities $ 197.9 $ 0.5 $ (2.1 ) $ 196.3 U.S. government agencies 126.3 0.7 (3.0 ) 124.0 Municipal bonds 881.2 4.7 (15.0 ) 870.9 Foreign government 253.6 0.9 (4.3 ) 250.2 Corporate bonds: Finance 2,090.2 5.2 (38.6 ) 2,056.8 Industrial 2,385.7 8.1 (53.5 ) 2,340.3 Utilities 318.3 2.2 (6.6 ) 313.9 Commercial mortgage-backed securities 386.1 1.4 (16.0 ) 371.5 Residential mortgage-backed securities: Agency backed 1,025.9 0.2 (23.5 ) 1,002.6 Non-agency backed 0.6 0.1 — 0.7 Collateralized loan / debt obligation 951.3 3.3 (4.1 ) 950.5 Asset backed securities 18.9 0.1 — 19.0 Total available-for-sale securities $ 8,636.0 $ 27.4 $ (166.7 ) $ 8,496.7 As of December 31, 2017 (1) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. treasury securities $ 301.6 $ 0.9 $ (3.2 ) $ 299.3 U.S. government agencies 51.1 — (0.6 ) 50.5 Municipal bonds 1,035.5 15.9 (5.9 ) 1,045.5 Foreign government 151.4 3.5 (3.2 ) 151.7 Corporate bonds: Finance 1,733.2 48.1 (11.9 ) 1,769.4 Industrial 2,237.0 57.3 (26.1 ) 2,268.2 Utilities 323.8 10.7 (2.1 ) 332.4 Commercial mortgage-backed securities 419.3 3.8 (10.4 ) 412.7 Residential mortgage-backed securities: Agency backed 562.0 5.8 (11.4 ) 556.4 Non-agency backed 6.9 — (0.1 ) 6.8 Collateralized loan / debt obligation 591.2 9.7 (0.3 ) 600.6 Asset backed securities 30.1 0.1 (0.1 ) 30.1 Less: Assets classified as held for sale (See Note 13) (34.4 ) (0.9 ) — (35.3 ) Total available-for-sale securities $ 7,408.7 $ 154.9 $ (75.3 ) $ 7,488.3 (1) In connection with the adoption of ASU 2016-01, the disclosure for December 31, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01. Proceeds from the sales of investments in available-for-sale securities were $763.8 and $715.9 during the three months ended September 30, 2018 and 2017 , respectively, and $1,842.9 and $1,704.2 during the nine months ended September 30, 2018 and 2017 , respectively. A summary of the Company’s available-for-sale securities as of September 30, 2018 and December 31, 2017 , by contractual maturity, is shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. September 30, 2018 December 31, 2017 Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 273.7 $ 271.8 $ 228.1 $ 226.7 Due after one through five years 2,045.3 2,032.6 1,811.3 1,845.5 Due after five through ten years 3,357.1 3,277.9 3,199.7 3,239.8 Due after ten years 577.1 570.1 594.5 605.0 Mortgage and asset backed securities 2,382.8 2,344.3 1,609.5 1,606.6 Less: Assets classified as held for sale (See Note 13) — — (34.4 ) (35.3 ) Total $ 8,636.0 $ 8,496.7 $ 7,408.7 $ 7,488.3 The tables below summarize the gross unrealized losses of the Company's available-for-sale securities by length of time the security has continuously been in an unrealized loss position as of September 30, 2018 and December 31, 2017 : Less Than 12 Months 12 Months or More Total As of September 30, 2018 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. treasury securities $ 7.2 $ (0.1 ) $ 182.6 $ (2.0 ) $ 189.8 $ (2.1 ) U.S. government agencies 75.5 (1.8 ) 27.8 (1.2 ) 103.3 (3.0 ) Municipal bonds 445.0 (8.8 ) 162.9 (6.2 ) 607.9 (15.0 ) Foreign government 185.7 (3.4 ) 17.6 (0.9 ) 203.3 (4.3 ) Corporate bonds: Finance 1,567.0 (32.0 ) 144.7 (6.6 ) 1,711.7 (38.6 ) Industrial 1,552.8 (40.1 ) 229.4 (13.4 ) 1,782.2 (53.5 ) Utilities 204.1 (5.6 ) 23.7 (1.0 ) 227.8 (6.6 ) Commercial mortgage-backed securities 159.9 (6.1 ) 131.0 (9.9 ) 290.9 (16.0 ) Residential mortgage-backed securities: Agency backed 803.9 (15.3 ) 127.8 (8.2 ) 931.7 (23.5 ) Collateralized loan / debt obligations 474.9 (4.1 ) — — 474.9 (4.1 ) Total $ 5,476.0 $ (117.3 ) $ 1,047.5 $ (49.4 ) $ 6,523.5 $ (166.7 ) Less Than 12 Months 12 Months or More Total As of December 31, 2017 (1) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. treasury securities $ 41.9 $ (0.5 ) $ 247.0 $ (2.7 ) $ 288.9 $ (3.2 ) U.S. government agencies 48.7 (0.6 ) 0.5 — 49.2 (0.6 ) Municipal bonds 171.3 (2.7 ) 178.7 (3.2 ) 350.0 (5.9 ) Foreign government 57.4 (2.2 ) 17.1 (1.0 ) 74.5 (3.2 ) Corporate bonds: Finance 419.3 (9.7 ) 91.5 (2.2 ) 510.8 (11.9 ) Industrial 437.1 (16.4 ) 255.4 (9.7 ) 692.5 (26.1 ) Utilities 72.5 (2.0 ) 11.9 (0.1 ) 84.4 (2.1 ) Commercial mortgage-backed securities 81.5 (4.1 ) 157.5 (6.3 ) 239.0 (10.4 ) Residential mortgage-backed securities: Agency backed 91.7 (4.7 ) 167.8 (6.7 ) 259.5 (11.4 ) Non-agency backed 2.9 — 0.8 (0.1 ) 3.7 (0.1 ) Collateralized loan / debt obligations 56.8 (0.2 ) 4.3 (0.1 ) 61.1 (0.3 ) Asset backed securities 7.1 — 3.1 (0.1 ) 10.2 (0.1 ) Total $ 1,488.2 $ (43.1 ) $ 1,135.6 $ (32.2 ) $ 2,623.8 $ (75.3 ) (1) In connection with the adoption of ASU 2016-01, the disclosure for December 31, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01. There were 3,832 and 2,086 individual security lots as of September 30, 2018 and December 31, 2017 , respectively, that account for the gross unrealized loss, none of which is deemed by the Company to be other-than-temporarily impaired ("OTTI"). The Company analyzes its fixed maturity securities in an unrealized loss position for OTTI each reporting period. Beginning January 1, 2018, the Company generally evaluates an investment for impairment when it has been in an unrealized loss position of 20% or more of amortized cost for twelve consecutive months. As of September 30, 2018 , the Company has determined that the unrealized losses on fixed maturity securities were primarily due to market interest rate movements since their date of purchase. As of September 30, 2018 , for the $49.4 of unrealized losses related to securities in unrealized loss positions for a period of twelve or more consecutive months, $0.5 was related to securities in unrealized loss positions greater than or equal to 20% of amortized cost or cost. There were no material credit-related OTTI charges on available-for-sale securities for the three and nine months ended September 30, 2018 and 2017 . (b) Trading Securities The amortized cost, gross unrealized gains and losses, and estimated fair value of securities classified as trading as of September 30, 2018 and December 31, 2017 are presented in the tables below: As of September 30, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Corporate bonds: Industrial $ 3.7 $ — $ (0.5 ) $ 3.2 Total trading securities $ 3.7 $ — $ (0.5 ) $ 3.2 As of December 31, 2017 (1) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Corporate bonds: Industrial $ 26.7 $ 0.1 $ (2.4 ) $ 24.4 Finance 0.5 — — 0.5 U.S. treasury securities 25.0 — (0.1 ) 24.9 Total trading securities $ 52.2 $ 0.1 $ (2.5 ) $ 49.8 (1) In connection with the adoption of ASU 2016-01, the disclosure for December 31, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01. Proceeds from the sales of investments in trading securities were approximately $165.6 and $70.5 during the three months ended September 30, 2018 and 2017 , respectively, and $448.5 and $379.9 during the nine months ended September 30, 2018 and 2017 , respectively. The table below shows the portion of trading gains and losses for the period related to trading securities still held during the three months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 (1) 2018 2017 (1) Net gains (losses) recognized during the period on trading securities $ 1.6 $ 1.7 $ (3.4 ) $ (2.9 ) Less: Net losses (gains) recognized during the period on trading securities sold during the period 0.9 1.9 (3.0 ) 4.2 Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date $ 0.7 $ (0.2 ) $ (0.4 ) $ (7.1 ) (1) In connection with the adoption of ASU 2016-01, the disclosure for the three and nine months ended September 30, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01. (c) Equity Securities In accordance with the adoption of ASU 2016-01, the Company's equity securities are no longer bifurcated between available-for-sale and trading, but rather are measured at fair value with changes in fair value recognized in earnings. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01. The original cost, gross unrealized gains and losses, and estimated fair value of the Company's equity securities as of September 30, 2018 and December 31, 2017 , are presented below: As of September 30, 2018 Original Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Preferred stock $ 0.6 $ — $ — $ 0.6 Common stock 122.6 32.8 (16.7 ) 138.7 Total equity securities $ 123.2 $ 32.8 $ (16.7 ) $ 139.3 As of December 31, 2017 Original Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Preferred stock $ 0.5 $ — $ — $ 0.5 Common stock 195.4 30.6 (14.8 ) 211.2 Total equity securities $ 195.9 $ 30.6 $ (14.8 ) $ 211.7 Proceeds from the sales of investments in equity securities were approximately $70.8 and $41.8 during the three months ended September 30, 2018 and 2017 , respectively, and $252.5 and $193.5 during the nine months ended September 30, 2018 and 2017 , respectively. The table below shows the portion of gains and losses for the period related to equity securities still held during the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Net gains (losses) recognized during the period on equity securities $ 2.6 $ (5.3 ) $ 11.3 $ 11.7 Less: Net losses (gains) recognized during the period on equity securities sold during the period 2.2 (2.2 ) 0.8 (7.2 ) Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date $ 0.4 $ (3.1 ) $ 10.5 $ 18.9 (d) Investment Income Net investment income for the three and nine months ended September 30, 2018 and 2017 was derived from the following sources: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Fixed maturity securities, available-for-sale $ 62.4 $ 60.5 $ 183.8 $ 187.2 Fixed maturity securities, trading (1.3 ) 0.5 3.5 1.5 Equity securities (1) 0.1 0.3 0.8 1.9 Cash and short term investments 3.9 5.7 12.7 9.0 Other invested assets 6.1 (0.7 ) 12.8 (15.7 ) Total investment income 71.2 66.3 213.6 183.9 Investment expenses and interest expense on securities sold under agreement to repurchase (1.4 ) (5.2 ) (7.3 ) (10.2 ) Net investment income $ 69.8 $ 61.1 $ 206.3 $ 173.7 (1) In connection with the adoption of ASU 2016-01, the disclosure for the three and nine months ended September 30, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01. (e) Realized Gains and Losses The tables below summarize the gross and net realized gains and (losses) for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, 2018 2017 Gross Gains Gross Losses Net Gains (Losses) Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 23.5 $ (7.6 ) $ 15.9 $ 15.6 $ (1.1 ) $ 14.5 Fixed maturity securities, trading 1.6 — 1.6 1.7 — 1.7 Equity securities (1) 8.5 (5.9 ) 2.6 15.4 (10.6 ) 4.8 Other invested assets — — — 3.5 — 3.5 Other-than-temporary impairment of other invested assets — (4.5 ) (4.5 ) — — — Total $ 33.6 $ (18.0 ) $ 15.6 $ 36.2 $ (11.7 ) $ 24.5 Nine Months Ended September 30, 2018 2017 Gross Gains Gross Losses Net Gains (Losses) Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 43.4 $ (23.4 ) $ 20.0 $ 38.0 $ (3.2 ) $ 34.8 Fixed maturity securities, trading 3.0 (6.4 ) (3.4 ) 6.9 (9.8 ) (2.9 ) Equity securities (1) 32.2 (20.9 ) 11.3 36.4 (31.2 ) 5.2 Other invested assets 0.2 — 0.2 19.5 — 19.5 Other-than-temporary impairment of other invested assets — (4.5 ) (4.5 ) — — — Other-than-temporary impairment of fixed maturity securities, available-for-sale — (0.3 ) (0.3 ) — — — Total $ 78.8 $ (55.5 ) $ 23.3 $ 100.8 $ (44.2 ) $ 56.6 (1) In connection with the adoption of ASU 2016-01, the disclosure for the three and nine months ended September 30, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01. (f) Restricted Cash and Investments The Company, in order to conduct business in certain states, is required to maintain letters of credit or assets on deposit to support state mandated regulatory requirements and certain third party agreements. The Company also utilizes trust accounts to collateralize business with its reinsurance counterparties. These assets are primarily in the form of cash and certain investment grade securities. The fair values of the Company's restricted assets as of September 30, 2018 and December 31, 2017 are as follows: September 30, 2018 December 31, 2017 Restricted cash and cash equivalents $ 439.0 $ 480.1 Restricted investments 3,333.4 3,193.8 Total restricted cash, cash equivalents and investments $ 3,772.4 $ 3,673.9 (g) Other Securities sold but not yet purchased are securities that the Company has sold, but does not own, in anticipation of a decline in the market value of the security. For more information related to these agreements, see Note 3. "Investments" to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 . The Company’s liability for securities to be delivered is measured at fair value and was $33.1 and $75.5 as of September 30, 2018 and December 31, 2017 , respectively. From time to time, the Company enters into repurchase agreements that are subject to a master netting arrangement, which are accounted for as collateralized borrowing transactions and are recorded at contract amounts. The Company receives cash or securities that it invests or holds in short term or fixed maturity securities. For more information related to these agreements, see Note 2. "Significant Accounting Policies" to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 . As of September 30, 2018 , the Company had 14 individual repurchase agreements outstanding with a principal amount of $233.8 , which approximates fair value, at interest rates between 2.2% and 2.7% . The Company had approximately $248.5 of collateral pledged in support of these agreements as of September 30, 2018 . As of December 31, 2017 , the Company had no repurchase agreements outstanding.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The following tables present the level within the fair value hierarchy at which the Company’s financial assets and financial liabilities are measured on a recurring basis as of September 30, 2018 and December 31, 2017 : As of September 30, 2018 Total Level 1 Level 2 Level 3 Financial Assets U.S. treasury securities $ 196.3 $ 196.3 $ — $ — U.S. government agencies 124.0 — 124.0 — Municipal bonds 870.9 — 870.0 0.9 Foreign government 250.2 — 250.2 — Corporate bonds and other bonds: Finance 2,056.8 — 2,056.8 — Industrial 2,343.5 — 2,343.5 — Utilities 313.9 — 313.9 — Commercial mortgage-backed securities 371.5 — 351.5 20.0 Residential mortgage-backed securities: Agency backed 1,002.6 — 1,002.6 — Non-agency backed 0.7 — 0.7 — Collateralized loan / debt obligations 950.5 — 950.5 — Asset-backed securities 19.0 — 18.2 0.8 Equity securities 139.3 137.9 0.7 0.7 Short term investments 198.0 — 198.0 — Other investments 4.1 — — 4.1 Life settlement contracts 1.9 — — 1.9 Total financial assets $ 8,843.2 $ 334.2 $ 8,480.6 $ 28.4 Financial Liabilities Securities sold but not yet purchased $ 33.1 $ 33.0 $ 0.1 $ — Securities sold under agreements to repurchase 233.8 — 233.8 — Life settlement contract profit commission 3.0 — — 3.0 Contingent consideration 25.7 — — 25.7 Total financial liabilities $ 295.6 $ 33.0 $ 233.9 $ 28.7 As of December 31, 2017 Total Level 1 Level 2 Level 3 Financial Assets U.S. treasury securities $ 324.2 $ 324.2 $ — $ — U.S. government agencies 50.5 — 50.5 — Municipal bonds 1,045.5 — 1,045.1 0.4 Foreign government 151.7 — 151.7 — Corporate bonds and other bonds: Finance 1,769.9 — 1,769.9 — Industrial 2,292.6 — 2,292.6 — Utilities 332.4 — 332.4 — Commercial mortgage-backed securities 412.7 — 389.8 22.9 Residential mortgage-backed securities: Agency backed 556.4 — 556.4 — Non-agency backed 6.8 — 6.8 — Collateralized loan / debt obligations 600.6 — 600.6 — Asset-backed securities 30.1 — 29.3 0.8 Equity securities 211.7 210.7 0.5 0.5 Short term investments 187.8 — 187.8 — Other investments 5.0 — — 5.0 Life settlement contracts 20.8 — — 20.8 Less: Fixed maturity securities classified as held for sale (see note 13) (35.3 ) — (35.3 ) — Total financial assets (1) $ 7,963.4 $ 534.9 $ 7,378.1 $ 50.4 Financial Liabilities Securities sold but not yet purchased $ 75.5 $ 70.8 $ 4.7 $ — Life settlement contract profit commission 3.2 — — 3.2 Contingent consideration 75.4 — — 75.4 Total financial liabilities (2) $ 154.1 $ 70.8 $ 4.7 $ 78.6 (1) Does not include assets held for sale of $900.9 carried at fair value and classified as Level 2 within the fair value hierarchy as of December 31, 2017. See Note 13. "Divestiture" for additional information. (2) Does not include liabilities held for sale of $761.7 carried at fair value and classified as Level 2 within the fair value hierarchy as of December 31, 2017. See Note 13. "Divestiture" for additional information. The following table provides a summary of changes in fair value of the Company’s Level 3 financial assets and liabilities for the three and nine months ended September 30, 2018 and 2017 . The transfers into and out of Level 3 were due to changes in the availability of market observable inputs. All transfers are reflected in the table at fair value as of the end of the reporting period. Balance as of June 30, 2018 Net (loss) Other comprehensive (loss) Purchases and issuances Sales and settlements Net transfers into Level 3 Balance as of September 30, Fixed maturities, available-for-sale $ 23.5 $ — $ (0.9 ) $ — $ (0.9 ) $ — $ 21.7 Equity securities 0.8 (0.1 ) — — — — 0.7 Other investments 4.1 — — — — — 4.1 Life settlement contracts 1.9 — — — — — 1.9 Life settlement contract profit commission (3.2 ) 0.2 — — — — (3.0 ) Contingent consideration (31.2 ) 6.0 — (0.5 ) — — (25.7 ) Total $ (4.1 ) $ 6.1 $ (0.9 ) $ (0.5 ) $ (0.9 ) $ — $ (0.3 ) Balance as of June 30, 2017 Net income (loss) Other comprehensive income (loss) Purchases and issuances Sales and settlements Net transfers into Level 3 Balance as of September 30, Fixed maturities, available-for-sale $ 41.5 $ — $ 0.2 $ 2.0 $ (1.2 ) $ (8.4 ) $ 34.1 Equity securities 23.5 0.6 (0.5 ) — (21.5 ) (0.4 ) 1.7 Life settlement contracts 396.8 33.6 — — (131.7 ) — 298.7 Life settlement contract profit commission (5.7 ) (0.2 ) — — — — (5.9 ) Contingent consideration (97.7 ) 3.3 — (1.9 ) 11.8 — (84.5 ) Total $ 358.4 $ 37.3 $ (0.3 ) $ 0.1 $ (142.6 ) $ (8.8 ) $ 244.1 Balance as of December 31, 2017 Net (loss) income Other comprehensive (loss) Purchases and issuances Sales and settlements Net transfers into Level 3 Balance as of September 30, Fixed maturities, available-for-sale $ 24.1 $ (0.3 ) $ (0.1 ) $ — $ (2.0 ) $ — $ 21.7 Equity securities 0.5 0.2 — — — — 0.7 Other investments 5.0 (0.5 ) — — (0.4 ) — 4.1 Life settlement contracts 20.8 2.3 — — (21.2 ) — 1.9 Life settlement contract profit commission (3.2 ) 0.2 — — — — (3.0 ) Contingent consideration (75.4 ) 7.1 — (0.5 ) 43.1 — (25.7 ) Total $ (28.2 ) $ 9.0 $ (0.1 ) $ (0.5 ) $ 19.5 $ — $ (0.3 ) Balance as of December 31, 2016 Net income (loss) Other comprehensive (loss) Purchases and issuances Sales and settlements Net transfers into Level 3 Balance as of September 30, Fixed maturities, available-for-sale $ 46.9 $ — $ (0.3 ) $ 9.5 $ (4.0 ) $ (18.0 ) $ 34.1 Equity securities 24.4 0.2 (0.2 ) 4.6 (40.3 ) 13.0 1.7 Life settlement contracts 356.9 82.2 — 16.5 (156.9 ) — 298.7 Life settlement contract profit commission (4.9 ) (1.0 ) — — — — (5.9 ) Contingent consideration (71.7 ) (0.4 ) — (29.0 ) 16.6 — (84.5 ) Total $ 351.6 $ 81.0 $ (0.5 ) $ 1.6 $ (184.6 ) $ (5.0 ) $ 244.1 The Company uses the following methods and assumptions in estimating its fair value disclosures for financial instruments: • Equity and Fixed Maturity Investments: As of September 30, 2018 , the Company's Level 3 securities consisted primarily of a commercial mortgage-backed security. The fair value of this fixed maturity security as of September 30, 2018 was measured using valuation techniques involving unobservable inputs. • Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, and Short Term Investments: The carrying value of cash and cash equivalents, restricted cash and cash equivalents, and short term investments approximate their respective fair value and are classified as Level 2 in the fair value hierarchy. • Premiums Receivable, Accrued Interest, Reinsurance Recoverables: The carrying values reported in the accompanying balance sheets for these financial instruments approximate their fair values due to the short term nature of the asset and are classified as Level 1 in the financial hierarchy. • Equity Investment in Unconsolidated Subsidiaries - Related Party: In June 2017, the Company sold 10,586,000 common shares of National General Holdings Corp, a publicly-held insurance holding company ("NGHC"). As a result of the sale, the Company ceased accounting for this investment under the equity method. The Company has classified its investment in NGHC common stock of $45.9 and $33.6 as of September 30, 2018 and December 31, 2017, respectively, as equity securities. • Subordinated Debentures and Debt: The fair value of the Company's debt arrangements as of September 30, 2018 was as follows: September 30, 2018 Carrying Value Fair Value Revolving credit facility $ 130.0 $ 130.0 5.5% Convertible senior notes due 2021 5.5 5.5 2.75% Convertible senior notes due 2044 178.2 219.5 6.125% Senior notes due 2023 248.7 243.9 Junior subordinated debentures due 2035-2037 122.2 108.5 Trust preferred securities due 2033-2037 92.8 86.5 7.25% Subordinated Notes due 2055 145.4 140.9 7.50% Subordinated Notes due 2055 130.9 131.0 Secured loan agreements 158.5 158.5 Promissory notes and other 112.8 112.8 Total debt $ 1,325.0 $ 1,337.1 The 7.25% subordinated notes due 2055, the 7.50% subordinated notes due 2055, the 2.75% convertible senior notes due 2044, and the 6.125% notes due 2023 are publicly traded instruments and are classified as Level 1 in the fair value hierarchy. The fair value of the junior subordinated debentures due 2035-2037 and trust preferred securities due 2033-2037 were determined using the Black-Derman-Toy interest rate lattice model and are classified as Level 3 in the fair value hierarchy. In determining the fair value of its remaining debt, the Company uses estimates based on rates currently available to the Company for debt with similar terms and remaining maturities. Accordingly, the fair value of the Republic promissory note and other debt is classified as Level 2 within the valuation hierarchy. The Company considers its other debt's carrying value to approximate fair value as their interest rates approximate current borrowing rates. • Securities sold but not yet purchased : The Company's securities sold but not yet purchased consist of equity and fixed maturity securities and are valued and classified within the fair value hierarchy accordingly. • Securities sold under agreements to repurchase : The Company's securities sold under agreements to repurchase are classified as Level 2 in the fair value hierarchy and approximate their fair values due to the short-term and secured nature of the liabilities. • Contingent consideration: The fair value of contingent consideration is based on a discounted cash flow methodology and is classified as Level 3 in the fair value hierarchy. The range of discount rates used for contingent consideration was primarily between 11% and 30% .

Loss and loss adjustment expens

Loss and loss adjustment expense reserves	9 Months Ended
	Sep. 30, 2018
Insurance [Abstract]
Loss and loss adjustment expense reserves	Loss and Loss Adjustment Expense Reserves The following table provides a reconciliation of the beginning and ending balances for loss and loss adjustment expense ("Loss and LAE") reserves for the nine months ended September 30, 2018 , and 2017 , respectively: Nine Months Ended September 30, 2018 2017 Loss and LAE reserves, gross of related reinsurance recoverables at beginning of year $ 12,138.8 $ 10,140.7 Less: Reinsurance recoverables at beginning of year 5,669.6 3,873.8 Net balance, beginning of year 6,469.2 6,266.9 Incurred related to: Current year 2,927.1 2,712.0 Prior year 42.7 418.9 Total incurred during the period 2,969.8 3,130.9 Paid related to: Current year (778.0 ) (699.3 ) Prior year (1,731.9 ) (1,593.6 ) Total paid during the period (2,509.9 ) (2,292.9 ) Acquired loss and loss adjustment reserves and other 8.3 200.8 Retroactive reinsurance adjustment 18.7 (1,025.0 ) Effect of foreign exchange rates (76.8 ) 138.3 Net balance, end of period 6,879.3 6,419.0 Plus reinsurance recoverables at end of period 5,671.9 5,667.6 Loss and LAE reserves, at end of period $ 12,551.2 $ 12,086.6 The Company's Loss and LAE reserves, gross of related reinsurance recoverables, increased $412.4 and $1,945.9 during the nine months ended September 30, 2018 and 2017 , respectively. The Company had adverse prior period reserve development of $42.7 during the nine months ended September 30, 2018 after reflecting a $18.7 gain on an adverse development cover ("ADC") obtained in 2017. Prior to the gain on the ADC, the Company's total nine-month prior period reserve development is $61.4 . Consistent with prior periods, the actuarial process was driven by updated and new incurred and paid loss data, continued review of actuarial diagnostics, and actuarial analysis based on updated data for the period. For the nine months ended September 30, 2018 , adverse development of approximately $70.3 was recognized in the Commercial Auto Liability portfolios in the Company's Small Commercial Business and Specialty Program segments primarily on accident years 2014 through 2017, driven by severity trends that exceeded prior expectations and actuarial analysis using updated data for the period. The Company is currently engaged in re-underwriting and devoting additional claims resources/focus to the existing auto liability portfolio to mitigate risks of future development. Additionally, $48.3 of adverse development was reflected in the Small Commercial Business segment General Liability portfolio, largely driven by severity trends that exceeded prior expectations in the regional New York/New Jersey policies related to the acquisition of Tower renewal business for accident years 2014 and 2015 and large loss development on Excess & Surplus lines policies. Lastly, $38.3 of adverse development was driven primarily by long-tailed terminated programs, particularly general liability programs, in the Company's Specialty Program segment. Offsetting a portion of this adverse development was approximately $61.0 of favorable development recognized in the Workers' Compensation portfolios in the Company's Small Commercial Business and Specialty Program segments primarily on accident years 2014 through 2017, driven by on-going claim operational initiatives focused on the review of benefit providers, legal services, and expense containment. Additionally in these segments, positive trends in closure and settlement activity on loss exposures related to run-off Workers’ Compensation programs from the Republic acquisition resulted in $34.3 of favorable development. In the Specialty Risk and Extended Warranty segment the Company experienced $20.5 of favorable development primarily related to short-tail lines of business, including Accident and Health, Surety, Credit and Property and Warranty and Unique Risk exposures. The Company's adverse prior period reserve development was $418.9 for the nine months ended September 30, 2017 , primarily due to adverse loss experience in the Company's Specialty Program segment's general liability and auto liability portfolios, and the Company's Small Commercial Business segment's auto liability portfolio. In setting its reserves, the Company utilizes a combination of Company loss development factors and industry-wide loss development factors. In the event that the Company’s losses develop more favorably (adversely) than the industry, as a whole, the Company’s liabilities for unpaid losses and LAE may decrease (increase). Company management believes that its use of both its historical experience and industry-wide loss development factors provide a reasonable basis for estimating future losses. In either case, future events beyond the control of management, such as changes in or judicial interpretations of law and inflation, may favorably or unfavorably impact the ultimate settlement of the Company’s Loss and LAE reserves. The anticipated effect of inflation is implicitly considered when estimating Loss and LAE reserves. While the Company considers anticipated changes in claim costs due to inflation in estimating the ultimate claim costs, the increase in average severity of claims is caused by a number of factors that vary with the individual type of policy written. The Company projects future average severities based on historical trends adjusted for implemented changes in underwriting standards, policy provisions, and general economic trends. The Company monitors those anticipated trends based on actual development and makes modifications, if necessary.

Debt

Debt	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt The Company’s outstanding debt consisted of the following at September 30, 2018 and December 31, 2017 : September 30, 2018 December 31, 2017 Revolving credit facility $ 130.0 $ 130.0 5.5% Convertible senior notes due 2021 (the "2021 Notes") 5.5 5.4 2.75% Convertible senior notes due 2044 (the "2044 Notes") 178.2 173.0 6.125% Notes due 2023 (the "2023 Notes") 248.7 248.4 Junior subordinated debentures (the "2035-2037 Notes") 122.2 122.1 Trust preferred securities (the "2033-2037 TPS Notes") 92.8 92.8 7.25% Subordinated notes due 2055 (the "7.25% 2055 Notes") 145.4 145.3 7.50% Subordinated notes due 2055 (the "7.50% 2055 Notes") 130.9 130.8 Secured loan agreements 158.5 174.4 Promissory notes and other 112.8 66.5 Total debt $ 1,325.0 $ 1,288.7 Additionally, the Company utilizes various letters of credit in its operations. The following is a summary of the Company's letters of credit as of September 30, 2018 : Limit Outstanding Available Revolving credit facility $ 175.0 $ 173.9 $ 1.1 Funds at Lloyd's facility 592.9 564.3 28.6 ING Bank N.V., BHF Bank Aktiengesellschaft, and Deutsche Bank AG facilities 100.6 97.1 3.5 Comerica Bank facility 75.0 48.8 26.2 Other letters of credit, in aggregate 114.0 114.0 — On May 8, 2018, the Company, as Guarantor, and several of its wholly-owned subsidiaries, as Account Party and as Corporate Members, entered into a Second Amendment Agreement (the “FAL Amendment”) to its existing £455.0 (or $592.9 ) at September 30, 2018 ) Funds at Lloyd's facility agreement with ING Bank, N.V., London Branch, The Bank of Nova Scotia, London Branch and Bank of Montreal, London Branch (as amended from time to time, the “Lloyd’s Agreement”). The FAL Amendment revised the financial covenant related to realistic disaster scenario loss estimate calculations to exclude the Company's life syndicate, Syndicate 44, on a prospective basis, effective as of the date of the FAL Amendment. Additionally, the FAL Amendment revised the financial covenant related to forecast underwriting losses exceeding 25% of allocated capacity in respect of any one open year of account to now be calculated on the basis of aggregate forecast underwriting losses across the non-life syndicates (Syndicates 1861, 1206, 2526 and 5820) and a per syndicate basis for Syndicate 44. Under the financial covenant as included in the original Lloyd’s Agreement, forecast losses were calculated per syndicate rather than in the aggregate. This revised approach aligned the operation of the covenant with the consolidation of all non-life underwriting within Syndicate 1861 from January 1, 2018. The change to the forecast underwriting losses financial covenant is retroactively effective to the date of the Lloyd’s Agreement dated November 8, 2017. Interest expense, including amortization of original issue discount and deferred origination costs, as well as applicable bank fees, related to the Company's outstanding debt and letters of credit for the three and nine months ended September 30, 2018 and 2017 was: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Revolving credit facility $ 1.9 $ 1.6 $ 5.3 $ 4.6 2021 Notes 0.2 0.2 0.4 0.4 2044 Notes 3.4 3.3 10.1 9.7 2023 Notes 3.9 3.9 11.7 11.7 2035-2037 Notes 1.8 1.4 5.1 4.3 2033-2037 TPS Notes 1.4 1.1 3.9 3.2 7.25% 2055 Notes 2.8 2.8 8.3 8.3 7.50% 2055 Notes 2.6 2.6 7.7 7.7 Secured loan agreements 1.6 1.7 4.9 4.5 Promissory notes 1.1 0.9 2.8 3.6 Funds at Lloyd's facility 1.3 1.4 4.1 4.1 Other, including interest income 0.9 2.0 3.3 8.6 Total $ 22.9 $ 22.9 $ 67.6 $ 70.7 A detailed description of the Company's various debt arrangements is located in Note 13 to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 .

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table is a summary of the elements used in calculating basic and diluted earnings per share for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Numerator: Net (loss) income attributable to AmTrust common stockholders $ (84.5 ) $ (174.7 ) $ 461.1 $ (146.2 ) Denominator: Weighted average common shares outstanding – basic 197.6 195.9 196.9 182.6 Plus: Dilutive effect of stock options, convertible debt, other (1) — — 0.4 — Weighted average common shares outstanding – dilutive 197.6 195.9 197.3 182.6 Net (loss) income per AmTrust common share – basic $ (0.43 ) $ (0.89 ) $ 2.34 $ (0.80 ) Net (loss) income per AmTrust common share – diluted $ (0.43 ) $ (0.89 ) $ 2.34 $ (0.80 ) (1) In accordance with ASC 260, Earnings Per Share, no potential common shares are included in the computation of diluted per share amounts as the effect would be antidilutive for the three months ended September 30, 2018 and the three and nine months ended September 30, 2017.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax benefit for the nine months ended September 30, 2018 was $40.5 , which resulted in an effective tax rate of (8.1)% , compared to an income tax benefit of $61.0 for the nine months ended September 30, 2017 , which resulted in an effective tax rate of 28.5% . The decrease in the effective tax rate during the nine months ended September 30, 2018 compared to the nine months ended September 30, 2017 resulted from a lower U.S. statutory tax rate as a result of tax reform under the Tax Cuts and Jobs Act, which went into effect December 22, 2017, and an estimated permanent favorable tax adjustment on the gain related to the transfer of the Company's U.S.-based fee business on February 28, 2018. Income tax benefit for the three months ended September 30, 2018 was $21.5 , which resulted in an effective tax rate of 35.5% , compared to an income tax benefit of $62.6 for the three months ended September 30, 2017 , which resulted in an effective tax rate of 28.3% . The increase in the effective tax rate during the three months ended September 30, 2018 compared to the three months ended September 30, 2017 resulted from a shift in the Company's foreign operations from lower taxing jurisdictions to higher taxing jurisdictions, which was partially offset by the reduced U.S. statutory tax rate as a result of tax reform under the Tax Cuts & Jobs Act, which went into effect December 22, 2017, and by the estimated permanent adjustment related to the transfer of the Company's U.S.- based fee on February 28, 2018. As of September 30, 2018 , the Company has U.S. Net Operating Losses ("NOLs") of $62.2 that expire beginning in 2019 through 2038 . In addition, these NOLs are subject to certain limitations under Section 382 of the Internal Revenue Code due to changes in ownership of $9.1 per year. The Company also has foreign NOLs of $1,081.1 , of which a majority have no expiration. The Company’s management believes that as of September 30, 2018 , except for a portion of the NOLs, it will realize the benefits of its deferred tax assets, which are included as a component of other assets on the condensed consolidated balance sheet, due to the Company having an overall deferred tax asset position. As a result, the Company recorded a valuation allowance of $206.1 and $195.1 as of September 30, 2018 and December 31, 2017 , respectively. The increase in the valuation allowance from December 31, 2017 to September 30, 2018 was driven primarily by an adjustment to reflect the filed 2017 Luxembourg tax return, partially offset by a tax rate decrease in Luxembourg that reduced the Luxembourg NOLs, thereby requiring a reduction in the valuation allowance because the Luxembourg NOLs are in a full valuation allowance position. The Company did not utilize any equalization reserves attributed to its Luxembourg reinsurance companies during the nine months ended September 30, 2018 and 2017 , respectively. In accordance with the adoption of ASU 2018-02, the Company reclassed certain tax effects from accumulated other comprehensive (loss) income. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2018-02. For additional information relating to Income Taxes, see Note 18 to the Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 .

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions The Company has various reinsurance and service agreements with Maiden Holdings, Ltd. ("Maiden") and NGHC. For more information related to these agreements, see Note 15. "Related Party Transactions" to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2017. In addition, a related party transaction entered into by the Company and a Karfunkel-Zyskind Family affiliated entity is described in Note 1. "Basis of Reporting and Merger Agreement". With the exception of the agreements discussed below, there were no material changes to these agreements during the nine months ended September 30, 2018 . Merger Agreement The Company and Evergreen Parent entered into an expense assumption and assignment agreement whereby Evergreen Parent agreed to assume from the Company, effective upon closing of the Merger, the Company's obligations for the payment of all costs and expenses incurred by Evergreen Parent in connection with transactions contemplated by the Merger Agreement. As a result, during the three months ended September 30, 2018, the Company de-recognized, or recorded as an expense reimbursement, $33.5 of the $36.6 of the transaction expenses related to the Merger that had been previously recorded to other expense during the six months ended June 30, 2018. Asset Management Agreement - NGHC Effective May 1, 2018, NGHC's subsidiaries terminated their asset management agreements with the Company. Maiden Quota Share The quota share reinsurance agreement between AmTrust International Insurance Ltd. ("AII") and Maiden Reinsurance Ltd. ("Maiden Reinsurance") was renewed through June 30, 2019 and will automatically renew for successive three -year terms unless either AII or Maiden Reinsurance notifies the other of its election not to renew on or prior to January 31, 2019. In addition, either party is entitled to terminate on thirty days’ notice or less upon the occurrence of certain early termination events, which include a default in payment, insolvency, change in control of AII or Maiden Reinsurance, run-off, or a reduction of 50% or more of the shareholders’ equity of Maiden Reinsurance or the combined shareholders’ equity of AII and the Company's U.S., U.K. and Irish insurance subsidiaries that cede to AII. The Company is entitled to terminate the Maiden Quota Share on thirty days’ notice if Maiden Reinsurance fails to maintain an A.M. Best rating of "A-" or better. Maiden Reinsurance's current A.M. Best rating is "A-", under review with negative implications.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Stockholders' Equity	Stockholders' Equity Stockholders' Equity The following tables summarize the activities and components of stockholders' equity: Common Stock Preferred Stock Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income (Loss) Retained Earnings Total AmTrust Financial Services, Inc. equity Non-controlling interest Total stockholders’ equity Balance, December 31, 2017 $ 2.1 $ 913.7 $ 1,639.6 $ (242.1 ) $ 15.5 $ 860.9 $ 3,189.7 $ 178.4 $ 3,368.1 Net cumulative effect adjustments — — — — (0.7 ) 0.7 — — — Net income (loss) — — — — — 678.4 678.4 (2.5 ) 675.9 Unrealized holding gain, net of tax — — — — (124.7 ) — (124.7 ) — (124.7 ) Reclassification adjustment — — — — (1.6 ) — (1.6 ) — (1.6 ) Foreign currency translation — — — — 62.2 — 62.2 (0.5 ) 61.7 Share exercises, compensation and other — — 1.3 1.6 — — 2.9 — 2.9 Common stock dividends — — — — — (33.4 ) (33.4 ) — (33.4 ) Preferred stock dividends — — — — — (16.6 ) (16.6 ) — (16.6 ) Balance, March 31, 2018 2.1 913.7 1,640.9 (240.5 ) (49.3 ) 1,490.0 3,756.9 175.4 3,932.3 Net (loss) — — — — — (99.7 ) (99.7 ) (3.8 ) (103.5 ) Unrealized holding gain, net of tax — — — — (12.2 ) — (12.2 ) — (12.2 ) Reclassification adjustment — — — — (2.5 ) — (2.5 ) — (2.5 ) Foreign currency translation — — — — (86.6 ) — (86.6 ) 0.5 (86.1 ) Distribution of non-controlling interest — — — — — — — (114.6 ) (114.6 ) Share exercises, compensation and other — — (18.1 ) 22.3 — — 4.2 — 4.2 Preferred stock dividends — — — — — (16.5 ) (16.5 ) — (16.5 ) Balance, June 30, 2018 2.1 913.7 1,622.8 (218.2 ) (150.6 ) 1,373.8 3,543.6 57.5 3,601.1 Net (loss) — — — — — (67.9 ) (67.9 ) (2.8 ) (70.7 ) Unrealized holding gain, net of tax — — — — (16.9 ) — (16.9 ) — (16.9 ) Reclassification adjustment — — — — (15.9 ) — (15.9 ) — (15.9 ) Foreign currency translation — — — — (29.0 ) — (29.0 ) — (29.0 ) Share exercises, compensation and other — — 4.9 2.3 — — 7.2 — 7.2 Preferred stock dividends — — — — — (16.6 ) (16.6 ) — (16.6 ) Balance, September 30, 2018 $ 2.1 $ 913.7 $ 1,627.7 $ (215.9 ) $ (212.4 ) $ 1,289.3 $ 3,404.5 $ 54.7 $ 3,459.2 Common Stock Preferred Stock Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income (Loss) Retained Earnings Total AmTrust Financial Services, Inc. equity Non-controlling interest Total stockholders’ equity Balance, December 31, 2016 $ 2.0 $ 913.7 $ 1,385.0 $ (310.9 ) $ (125.8 ) $ 1,405.1 $ 3,269.1 $ 196.5 $ 3,465.6 Net income — — — — — 39.2 39.2 10.7 49.9 Unrealized holding gain, net of tax — — — — 25.6 — 25.6 — 25.6 Reclassification adjustment — — — — (11.6 ) — (11.6 ) — (11.6 ) Foreign currency translation — — — — 13.9 — 13.9 — 13.9 Unrealized gain on interest rate swap — — — — 0.1 — 0.1 — 0.1 Share exercises, compensation and other — — 1.4 4.5 — — 5.9 — 5.9 Common stock dividends — — — — — (29.1 ) (29.1 ) — (29.1 ) Preferred stock dividends — — — — — (16.6 ) (16.6 ) — (16.6 ) Capital distributions, net — — — — — — — 8.6 8.6 Balance, March 31, 2017 2.0 913.7 1,386.4 (306.4 ) (97.8 ) 1,398.6 3,296.5 215.8 3,512.3 Net income — — — — — 22.4 22.4 6.4 28.8 Unrealized holding gain, net of tax — — — — 49.5 — 49.5 — 49.5 Reclassification adjustment — — — — (19.3 ) — (19.3 ) — (19.3 ) Foreign currency translation — — — — 62.7 — 62.7 — 62.7 Share exercises, compensation and other — — 1.0 3.0 — — 4.0 — 4.0 Common stock issuance 0.1 — 238.6 59.9 — — 298.6 — 298.6 Common stock dividends — — — — — (34.1 ) (34.1 ) — (34.1 ) Preferred stock dividends — — — — — (16.5 ) (16.5 ) — (16.5 ) Capital distributions, net — — — — — — — 10.7 10.7 Balance, June 30, 2017 2.1 913.7 1,626.0 (243.5 ) (4.9 ) 1,370.4 3,663.8 232.9 3,896.7 Net (loss) — — — — — (158.1 ) (158.1 ) (1.0 ) (159.1 ) Unrealized holding gain, net of tax — — — — 19.8 — 19.8 — 19.8 Reclassification adjustment — — — — (23.3 ) — (23.3 ) — (23.3 ) Foreign currency translation — — — — 50.6 — 50.6 — 50.6 Unrealized gain on interest rate swap — — — — 0.1 — 0.1 — 0.1 Share exercises, compensation and other — — 8.1 1.3 — — 9.4 — 9.4 Common stock dividends — — — — — (32.5 ) (32.5 ) — (32.5 ) Preferred stock dividends — — — — — (16.6 ) (16.6 ) — (16.6 ) Capital distributions, net — — — — — — — (50.6 ) (50.6 ) Balance, September 30, 2017 $ 2.1 $ 913.7 $ 1,634.1 $ (242.2 ) $ 42.3 $ 1,163.2 $ 3,513.2 $ 181.3 $ 3,694.5 During the nine months ended September 30, 2017 , net income attributable to non-controlling interest was $16.1 , and net income attributable to non-controlling interest and redeemable non-controlling interest of subsidiaries was $17.0 . During the nine months ended September 30, 2018 , net loss attributable to non-controlling interest was $9.1 , and net loss attributable to non-controlling interest and redeemable non-controlling interest of subsidiaries was $2.5 . Redeemable non-controlling interest of subsidiaries was extinguished with the transfer of the U.S.-based fee business during the nine months ended September 30, 2018 . Each share of the Company's preferred stock will remain outstanding in accordance with its terms through consummation of the proposed merger transaction. Accumulated Other Comprehensive Income (Loss) The following tables summarize the activities and components of accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2018 and 2017: Foreign Currency Items Unrealized Gains (Losses) on Investments Interest Rate Swap Hedge Net Benefit Plan Assets and Obligations Recognized in Stockholders' Equity Accumulated Other Comprehensive (Loss) Income Balance, June 30, 2018 $ (69.2 ) $ (79.1 ) $ — $ (2.3 ) $ (150.6 ) Other comprehensive loss before reclassification (29.0 ) (24.9 ) — — (53.9 ) Amounts reclassed out of accumulated other comprehensive loss — (15.9 ) — — (15.9 ) Income tax benefit — 8.0 — — 8.0 Net current-period other comprehensive loss (29.0 ) (32.8 ) — — (61.8 ) Balance, September 30, 2018 $ (98.2 ) $ (111.9 ) $ — $ (2.3 ) $ (212.4 ) Balance, June 30, 2017 $ (111.6 ) $ 110.0 $ (0.1 ) $ (3.2 ) $ (4.9 ) Other comprehensive income before reclassification 50.6 17.1 0.1 — 67.8 Amounts reclassed out of accumulated other comprehensive income — (23.3 ) — — (23.3 ) Income tax benefit — 2.7 — — 2.7 Net current-period other comprehensive income (loss) 50.6 (3.5 ) 0.1 — 47.2 Balance, September 30, 2017 $ (61.0 ) $ 106.5 $ — $ (3.2 ) $ 42.3 Foreign Currency Items Unrealized Gains (Losses) on Investments Interest Rate Swap Hedge Net Benefit Plan Assets and Obligations Recognized in Stockholders' Equity Accumulated Other Comprehensive Income (Loss) Balance, December 31, 2017 $ (44.8 ) $ 62.6 $ — $ (2.3 ) $ 15.5 Net cumulative effect adjustments (1) — (0.7 ) — — (0.7 ) Other comprehensive loss before reclassification (53.4 ) (199.8 ) — — (253.2 ) Amounts reclassed out of accumulated other comprehensive loss — (20.0 ) — — (20.0 ) Income tax benefit — 46.0 — — 46.0 Net current-period other comprehensive loss (53.4 ) (174.5 ) — — (227.9 ) Balance, September 30, 2018 $ (98.2 ) $ (111.9 ) $ — $ (2.3 ) $ (212.4 ) Balance, December 31, 2016 $ (188.2 ) $ 65.8 $ (0.2 ) $ (3.2 ) $ (125.8 ) Other comprehensive income before reclassification 127.2 115.1 0.2 — 242.5 Amounts reclassed out of accumulated other comprehensive income — (54.1 ) — — (54.1 ) Income tax expense — (20.3 ) — — (20.3 ) Net current-period other comprehensive income 127.2 40.7 0.2 — 168.1 Balance, September 30, 2017 $ (61.0 ) $ 106.5 $ — $ (3.2 ) $ 42.3 (1) See Note 2. "Recent Accounting Pronouncements" for additional information on the adoptions of ASU 2016-01 and ASU 2018-02.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Litigation The Company’s insurance subsidiaries are named as defendants in various legal actions arising principally from claims made under insurance policies and contracts. The Company considers these actions in estimating its Loss and LAE reserves. The Company is also a party to various commercial and employment disputes, including claims made both by and against the Company. The Company’s management believes the resolution of these actions will not have a material adverse effect on the Company’s financial position or results of operations. In view of the inherent difficulty of assessing the potential outcome of legal proceedings, governmental, regulatory and legislative investigations and inquiries, claims and litigation and similar matters and contingencies, the Company generally cannot predict what the eventual outcome of the pending matters will be or the timing of any resolution of such matters. Unless specified below, the Company cannot reasonably estimate a potential range of loss, if any, with respect to the matters disclosed below due to, among other factors, the complexity of the matters involved and in many instances, the relatively early stage of the proceedings. The Company also is not able to predict at this time the impact, if any, that any such matters might have on how its business is conducted, on its competitive position or on its financial position, results of operations or cash flows. As the process to resolve any pending matters progresses, management will continue to review the latest information available and assess its ability to predict the outcome of such matters and the effects, if any, on the Company's operations and financial condition and to accrue for and disclose such matters as and when required. Derivative Litigation On April 7, 2015, one of the Company's stockholders, Cambridge Retirement System (“Cambridge”), filed a derivative action in the Court of Chancery of the State of Delaware against the Company, as nominal defendant, and against the Company's board of directors, Leah Karfunkel, and ACP Re, as defendants. Cambridge amended its complaint on November 3, 2015 to add NGHC as a defendant. Cambridge purports to bring the derivative action on the Company's behalf, alleging breaches of the duties of loyalty and care on the part of the Company's board of directors and majority stockholders related to the Company's transactions involving Tower Group International, Ltd. Cambridge's claim against NGHC and ACP Re is for unjust enrichment. The amended complaint seeks damages, disgorgement and reform of the Company's governance practices. On April 27, 2017, one of the Company's stockholders, David Shaev Profit Sharing Plan, filed a derivative action in the Supreme Court of the State of New York for the County of New York ( Shaev v. DeCarlo et al. ). Two derivative suits have also been filed in the U.S. District Court for the District of Delaware. On May 11, 2017, one of the Company's stockholders, West Palm Beach Police Pension Fund, filed suit ( West Palm Beach Police Pension Fund v. Zyskind et al .), and on June 28, 2017, two of the Company's stockholders, City of Lauderhill Police Officers Retirement Plan and Pompano Beach Police & Firefighters Retirement System, filed suit ( City of Lauderhill Police Officers Retirement Plan and Pompano Beach Police & Firefighters Retirement System et al. v. Zyskind et al .). These two Delaware derivative actions have been consolidated under the case name In re AmTrust Financial Services, Inc. Derivative Litigation . Plaintiffs in this proceeding filed a Verified Amended Stockholder Derivative Complaint on November 7, 2017 and a Verified Second Amended Stockholder Derivative Complaint on December 11, 2017 (the “SAC”). The SAC alleges violations of Sections 10(b), 20A, and 29(b) of the Exchange Act, breaches of fiduciary duties, unjust enrichment, and corporate waste. Such stockholders purport to bring the derivative action on the Company's behalf and raise claims that primarily involve the Company's April 2017 restatement of its financial statements, the identification of material weaknesses in the Company's internal control over financial reporting and recent increases in the Company's loss reserves. The In re AmTrust Financial Services, Inc. Derivative Litigation SAC also seeks reform of the Company's governance practices and damages. The Company believes that the allegations in these pending derivative actions are unfounded and is vigorously pursuing its defenses. Securities Litigation The Company and certain of its officers and directors are also defendants in three putative securities class action lawsuits filed in March and April of 2017 in the U.S. District Court for the Southern District of New York. Another putative class action, filed in February 2017 in the U.S. District Court for the Central District of California, was voluntarily dismissed ( Miller v. AmTrust, Zyskind, and Pipoly ). The three cases in the Southern District of New York have been consolidated under the case name In re AmTrust Financial Services, Inc. Securities Litigation. Plaintiffs in this proceeding filed a consolidated, amended complaint on August 21, 2017 . Plaintiffs assert in the consolidated, amended complaint claims under Sections 10(b) and 20(a) of the Exchange Act, and Rule 10b-5 promulgated thereunder and Sections 11, 12(a)(2) and 15 of the Securities Act of 1933, as amended. The consolidated, amended complaint adds as defendants BDO USA LLP, Citigroup Global Markets Inc., Keefe, Bruyette & Woods, Inc., Morgan Stanley & Co. LLC, RBC Capital Markets, LLC, and UBS Securities LLC. Plaintiffs seek an unspecified amount in damages, attorneys’ fees, and other relief. The Company believes the allegations are unfounded and is vigorously pursuing its defenses. Section 220 Demands and Related Legal Proceedings Additionally, between April 2017 and May 2018, the Company received demands for the inspection of books and records pursuant to Section 220 of the Delaware General Corporation Law, from purported stockholders Rikhard Dauber, Pompano Beach Police & Firefighters Retirement System, Nestor Shust, the City of Lauderhill Police Officers’ Retirement Plan, the West Palm Beach Police Pension Fund, Cambridge, the Lislois Family Trust, Arca Capital Group (“Arca”) and Gabriel McLure (“McLure”). In May and June 2018, Arca and McLure, respectively, commenced legal proceedings against the Company in the Court of Chancery of the State of Delaware over the scope of the Company’s proposed production of documents in response to the Section 220 demands of Arca and McLure. The lawsuits are entitled Arca Investments, A.S., Arca Capital Bohemia, S.A., and Arca Venture Capital A.S. v AmTrust Financial Services, Inc. (Case No. 2018-0381) and Gabriel McLure v AmTrust Financial Services, Inc. (Case No. 2018-0400). The Arca Section 220 demand lawsuit was dismissed voluntarily on August 6, 2018. The McLure Section 220 demand lawsuit similarly was dismissed voluntarily on August 22, 2018. SEC Investigation Since June 2013, the Company has been responding to an investigation by the SEC, which in its course has included a review of the Company's investment in life settlement contracts, acquisition of Luxembourg captives, certain accounting practices, including accounting for loss and loss adjustment expense reserve estimates for the Company’s major business lines and segments, internal controls and other related matters. The Company cannot predict the eventual scope, duration or outcome of such inquiry or whether it could have a material impact on the Company’s financial condition, results of operations or cash flow. The Company has been responsive to this ongoing inquiry and will continue to be cooperative with regards to any governmental or regulatory inquiries or investigations. Litigation Related to the Merger Following the filing by the Company of its definitive proxy statement with the SEC on May 4, 2018, in connection with the special meeting of the stockholders of the Company to consider and vote upon a proposal to adopt the Amended Merger Agreement by and among Evergreen Parent, Evergreen Merger Sub, Inc., a Delaware corporation and wholly owned subsidiary of Evergreen Parent (“Merger Sub”), and the Company, on May 9, 2018, purported stockholders of the Company filed putative class action lawsuits against the Company and members of the Board in the United States District Court for the Southern District of New York, captioned Bartholomew v. AmTrust Fin’l Services, Inc., et al. , Case No. 1:18-cv-04178 (S.D.N.Y.) and Myhre v. AmTrust Fin’l Services, Inc., et al. , Case No. 1:18-cv-04175 (S.D.N.Y.), respectively. The complaints were substantially identical and alleged that the defendants violated Sections 14(a) and 20(a) of the Exchange Act because the preliminary proxy statement filed with the SEC on April 9, 2018 allegedly omitted material information with respect to the merger, thus rendering the preliminary proxy statement false and misleading. The complaints sought, among other things, injunctive relief preventing the consummation of the merger and costs of the applicable action, including reasonable allowance for plaintiff attorneys’ and experts’ fees. On July 6, 2018, the Bartholomew and Myhre actions were voluntarily dismissed. On May 15, 2018, a purported stockholder of the Company filed a putative class action lawsuit against the Company and members of the Board in the United States District Court for the Northern District of Ohio, captioned Shust v. AmTrust Fin’l Services, Inc., et al. , Case No. 1:18-cv-01129 (N.D. Ohio). On May 18, 2018, a purported stockholder of the Company filed a putative class action lawsuit against the Company and members of the Board in the United States District Court for the Southern District of New York, captioned Raul v. AmTrust Fin’l Services, Inc., et al. , Case No. 1:18-cv-04440 (S.D.N.Y.). On May 21, 2018, a purported stockholder of the Company filed a putative class action lawsuit against the Company, members of the Board (other than Mr. Serock), Evergreen Parent, Merger Sub and Stone Point in the United States District Court for the Southern District of New York, captioned Rabinowitz v. AmTrust Fin’l Services, Inc. , et al., Case No. 1:18-cv-04484 (S.D.N.Y.). Similar to the complaints described above, the complaints alleged that the defendants violated Sections 14(a) and 20(a) of the Exchange Act because the definitive proxy statement, in the case of the Shust complaint and the Rabinowitz complaint, and the preliminary proxy statement, in the case of the Raul complaint, omitted or misrepresented material information concerning the merger. The complaints sought, among other things, injunctive relief preventing the consummation of the merger unless additional disclosure was provided and costs of the applicable action, including for plaintiff attorneys’ and experts’ fees. The Shust, Raul and Rabinowitz actions were voluntarily dismissed on August 29, 2018, September 7, 2018 and July 23, 2018, respectively. On May 31, 2018, Pompano Beach Police & Firefighters’ Retirement System, City of Lauderhill Police Officers’ Retirement System and West Palm Beach Police Pension Fund filed a putative class action lawsuit against the Company’s board of directors, Stone Point, Trident Pine Acquisition LP (“Trident Pine”), Trident VII Professionals Fund, Trident VII, Trident VII DE Parallel Fund, and Trident VII Parallel Fund (collectively, the "Trident Funds") in the Court of Chancery of the State of Delaware, Case No. 2018-0396-AGB (the “2018 Pompano Action”). The complaint in the 2018 Pompano Action alleges that defendants Zyskind, G. Karfunkel, L. Karfunkel, Gulkowitz, Fisch, DeCarlo, and Rivera breached their fiduciary duties, which resulted in an unfair merger stock price through an unfair process. The complaint alleges additional claims for breaches of fiduciary duty against Zyskind, G. Karfunkel and L. Karfunkel in their capacity as officers and directors of the Company and as controlling stockholders of the Company. The complaint alleges that Stone Point, Trident Pine and the Trident Funds aided and abetted the breaches of fiduciary duties. On June 4, 2018, Cambridge filed a putative class action lawsuit against the Company’s board of directors, the Estate of Michael Karfunkel, Evergreen Parent, K-Z Evergreen, LLC, Merger Sub, Trident Pine and Stone Point in the Court of Chancery of the State of Delaware, Case No. 2018-0402-AGB (the “2018 Cambridge Action”). On September 24, 2018, Plaintiff in the 2018 Cambridge Action filed a Verified Supplemental and Amended Stockholder class action complaint (the “Amended Complaint”). Similar to the 2018 Pompano Action, the Amended Complaint alleges that the director defendants breached their fiduciary duties, which resulted in an unfair merger stock price through an unfair process. The Estate of Michael Karfunkel is not named as a Defendant in the Amended Complaint. The complaint alleges an additional claim for breach of fiduciary duty against Zyskind, G. Karfunkel, and L. Karfunkel in their capacity as controlling shareholders of the Company and alleges that Evergreen Parent, K-Z Evergreen, Merger Sub, Stone Point, and Trident Pine aided and abetted the foregoing breaches of fiduciary duties. On October 10, 2018, the court directed counsel in the 2018 Pompano Action and the 2018 Cambridge Action to file a proposed order to formally consolidate the 2018 Pompano Action and the 2018 Cambridge Action, designate the lead plaintiffs, and provide for the designation or filing of an operative consolidated complaint. The Company believes the allegations in the merger litigation described above are without merit. Other than as discussed above, the Company is not involved presently in any material litigation nor, to the Company’s knowledge, is any material litigation threatened against the Company or its properties.

Segments

Segments	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Segments	Segments The Company operates three business segments: Small Commercial Business; Specialty Risk and Extended Warranty; and Specialty Program. The Corporate and Other segment represents the activities of the holding company as well as a portion of service and fee income. Investment income and realized gains (losses) on investments are determined by calculating an overall annual return on cash and invested assets and applying that overall return to the cash and invested assets by segment. Ceding commission is allocated to each segment based on that segment’s proportionate share of the Company’s overall acquisition costs. Interest expense is allocated based on gross written premiums by segment. Income taxes are allocated on a pro-rata basis based on the Company’s effective tax rate. Additionally, management reviews the performance of underwriting results in assessing the performance of and making decisions regarding the allocation of resources to the segments. Underwriting results excludes, primarily, service and fee income, investment income and other revenues, other expenses, interest expense and income taxes. Management believes that providing information in this manner is essential to providing the Company’s stockholders with an understanding of the Company’s business and operating performance. The Company allocates certain underwriting, general and administrative (“U, G & A”) expenses to its operating segments, and regularly assesses the allocation assumptions and methodologies. In the current period, the Company changed how it allocates U, G & A expenses to the respective operating segments. Beginning on July 1, 2018, the Company began allocating all U, G & A expenses based on net earned premiums to better align its shared expenses with premiums earned, which provides the chief operating decision maker with information to properly assess segment performance based on the current circumstances of the underlying business mix within segments. In prior periods, portions of U, G & A expenses were allocated based on various metrics. Prior period amounts have been revised using the new allocation methodology for comparability. During the three and nine months ended September 30, 2018 , neither Small Commercial Business nor Specialty Risk and Extended Warranty derived over ten percent of its total revenue from one customer. During the three months ended September 30, 2018 , Specialty Program did not derive over ten percent of its total revenue from one customer. Specialty Program derived over ten percent of its total revenue during the nine months ended September 30, 2018 from a customer that was formerly a consolidated entity and was included in the transfer of the U.S.-based fee businesses completed on February 28, 2018. See Note 13. "Divestiture" for additional information on the transfer. The following tables summarize the results of operations of the business segments for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, 2018 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Revenues: Net earned premiums $ 646.5 $ 685.2 $ 93.5 $ — $ 1,425.2 Losses and expenses: Loss and loss adjustment expenses 473.3 474.2 115.7 — 1,063.2 Amortization of deferred acquisition costs 145.8 129.9 22.0 — 297.7 Underwriting, general and administrative expenses 77.2 82.7 11.1 — 171.0 Total losses and expenses 696.3 686.8 148.8 — 1,531.9 Underwriting loss (49.8 ) (1.6 ) (55.3 ) — (106.7 ) Other income (losses and expenses): Service and fee income 3.5 31.4 0.5 17.1 52.5 Investment income and realized gain on investments 38.0 33.2 14.2 — 85.4 Other expenses (18.5 ) (19.4 ) (3.9 ) (40.6 ) (82.4 ) Interest expense (10.8 ) (10.0 ) (2.1 ) — (22.9 ) Foreign currency gain — 14.0 — — 14.0 Other (expenses) revenues (2.0 ) (1.4 ) (0.3 ) 3.3 (0.4 ) Benefit (provision) for income taxes 17.2 (19.8 ) 10.5 13.6 21.5 Equity in (loss) earnings of unconsolidated subsidiaries — — — (31.7 ) (31.7 ) Net (loss) income $ (22.4 ) $ 26.4 $ (36.4 ) $ (38.3 ) $ (70.7 ) Three Months Ended September 30, 2017 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Revenues: Net earned premiums $ 529.1 $ 482.8 $ 181.0 $ — $ 1,192.9 Losses and expenses: Loss and loss adjustment expenses 546.2 458.3 261.6 — 1,266.1 Amortization of deferred acquisition costs 109.8 18.4 41.0 — 169.2 Underwriting, general and administrative expenses 74.7 67.6 25.6 — 167.9 Total losses and expenses 730.7 544.3 328.2 — 1,603.2 Underwriting loss (201.6 ) (61.5 ) (147.2 ) — (410.3 ) Other income (losses and expenses): Service and fee income 27.6 114.5 0.5 37.9 180.5 Investment income and realized gain on investments 33.0 33.5 19.1 — 85.6 Other expenses (45.2 ) (33.5 ) (10.0 ) (88.7 ) (177.4 ) Interest expense (11.7 ) (8.7 ) (2.5 ) — (22.9 ) Foreign currency loss — (62.8 ) — — (62.8 ) Other (expenses) revenues (0.5 ) (0.1 ) (0.1 ) 186.6 185.9 Benefit (provision) for income taxes 65.0 (39.2 ) 75.7 (38.9 ) 62.6 Net (loss) income $ (133.4 ) $ (57.8 ) $ (64.5 ) $ 96.9 $ (158.8 ) Nine Months Ended September 30, 2018 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Revenues: Net earned premiums $ 1,913.4 $ 1,840.4 $ 312.5 $ — $ 4,066.3 Losses and expenses: Loss and loss adjustment expenses 1,450.0 1,223.4 296.4 — 2,969.8 Amortization of deferred acquisition costs 392.1 350.4 77.1 — 819.6 Underwriting, general and administrative expenses 239.4 230.3 39.1 — 508.8 Total losses and expenses 2,081.5 1,804.1 412.6 — 4,298.2 Underwriting income (168.1 ) 36.3 (100.1 ) — (231.9 ) Other income (losses and expenses): Service and fee income 29.4 133.9 1.8 52.8 217.9 Investment income and realized gain on investments 101.5 90.7 37.4 — 229.6 Other expenses (104.1 ) (81.4 ) (17.7 ) (203.1 ) (406.3 ) Interest expense (34.6 ) (27.1 ) (5.9 ) — (67.6 ) Foreign currency gain — 28.9 — — 28.9 Other revenues 0.7 0.6 0.1 727.5 728.9 Benefit (provision) for income taxes 15.1 (15.7 ) 7.3 33.8 40.5 Equity in (loss) earnings of unconsolidated subsidiaries — — — (31.7 ) (31.7 ) Net (loss) income $ (160.1 ) $ 166.2 $ (77.1 ) $ 579.3 $ 508.3 Nine Months Ended September 30, 2017 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Revenues: Net earned premiums $ 1,714.6 $ 1,495.3 $ 586.2 $ — $ 3,796.1 Losses and expenses: Loss and loss adjustment expenses 1,390.5 1,141.8 598.6 — 3,130.9 Amortization of deferred acquisition costs 339.1 83.3 165.3 — 587.7 Underwriting, general and administrative expenses 203.6 177.6 69.6 — 450.8 Total losses and expenses 1,933.2 1,402.7 833.5 — 4,169.4 Underwriting (loss) gain (218.6 ) 92.6 (247.3 ) — (373.3 ) Other income (losses and expenses): Service and fee income 87.2 299.6 2.5 97.1 486.4 Investment income and realized gain on investments 95.2 87.4 47.7 — 230.3 Other expenses (141.9 ) (95.6 ) (32.6 ) (270.0 ) (540.1 ) Interest expense (37.2 ) (25.0 ) (8.5 ) — (70.7 ) Foreign currency loss — (139.7 ) — — (139.7 ) Other revenues 3.4 2.3 0.8 186.6 193.1 Benefit (provision) for income taxes 64.6 (42.3 ) 76.6 (37.9 ) 61.0 Equity in earnings of unconsolidated subsidiary – related party — — — 73.5 73.5 Net (loss) income $ (147.3 ) $ 179.3 $ (160.8 ) $ 49.3 $ (79.5 ) The following table summarizes net earned premiums by major line of business, by segment, for the three and nine months ended September 30, 2018 and 2017 : Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Three Months Ended September 30, 2018: Workers' compensation $ 369.4 $ — $ 40.4 $ 409.8 Warranty — 266.0 — 266.0 Commercial auto and liability, physical damage 124.9 — 26.1 151.0 Commercial multiple-peril 90.2 11.9 7.4 109.5 Other liabilities — 89.6 15.0 104.6 Medical malpractice — 56.0 — 56.0 Accident and health — 45.5 — 45.5 Surety 16.1 22.2 — 38.3 Homeowners multiple-peril 11.4 20.1 0.9 32.4 Fire 1.8 41.7 — 43.5 Inland Marine 2.0 23.1 — 25.1 Crop — 74.2 — 74.2 Other 30.7 34.9 3.7 69.3 Total net earned premiums $ 646.5 $ 685.2 $ 93.5 $ 1,425.2 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Three Months Ended September 30, 2017: Workers' compensation $ 339.6 $ — $ 84.4 $ 424.0 Warranty 0.9 242.2 — 243.1 Commercial auto and liability, physical damage 76.8 — 34.4 111.2 Commercial multiple-peril 84.0 — 11.8 95.8 Other liabilities — 37.5 48.6 86.1 Medical malpractice — 60.9 — 60.9 Accident and health — 27.5 — 27.5 Surety 13.7 31.3 — 45.0 Homeowners multiple-peril 7.5 2.6 0.2 10.3 Fire 2.7 30.2 — 32.9 Inland Marine 1.2 7.1 0.2 8.5 Crop — 28.2 — 28.2 Other 2.7 15.3 1.4 19.4 Total net earned premiums $ 529.1 $ 482.8 $ 181.0 $ 1,192.9 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Nine Months Ended September 30, 2018: Workers' compensation $ 1,124.3 $ — $ 151.2 $ 1,275.5 Warranty — 797.8 — 797.8 Commercial auto and liability, physical damage 363.5 — 80.7 444.2 Commercial multiple-peril 254.9 37.8 28.2 320.9 Other liabilities — 225.6 34.4 260.0 Medical malpractice — 160.4 — 160.4 Accident and health — 128.9 — 128.9 Surety 45.6 64.7 — 110.3 Homeowners multiple-peril 24.5 76.6 3.4 104.5 Fire 5.2 95.0 — 100.2 Inland Marine 5.3 61.6 — 66.9 Crop — 79.7 — 79.7 Other 90.1 112.3 14.6 217.0 Total net earned premiums $ 1,913.4 $ 1,840.4 $ 312.5 $ 4,066.3 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Nine Months Ended September 30, 2017: Workers' compensation $ 1,049.0 $ — $ 308.0 $ 1,357.0 Warranty 0.9 683.1 — 684.0 Commercial auto and liability, physical damage 273.5 — 88.9 362.4 Commercial multiple-peril 182.2 1.7 27.8 211.7 Other liabilities — 144.8 155.3 300.1 Medical malpractice — 167.6 — 167.6 Accident and health — 106.6 — 106.6 Surety 39.8 83.6 0.1 123.5 Homeowners multiple-peril 33.1 32.0 2.9 68.0 Fire 22.8 156.6 0.8 180.2 Inland Marine 4.2 24.9 1.3 30.4 Crop — 29.9 — 29.9 Other 109.1 64.5 1.1 174.7 Total net earned premiums $ 1,714.6 $ 1,495.3 $ 586.2 $ 3,796.1 The following table presents the Company's revenues from contracts with customers disaggregated by major business activity and primary geographic regions for the three and nine months ended September 30, 2018 : Three Months Ended September 30, 2018 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Major service lines Product warranty registration and service $ — $ 15.8 $ — $ — $ 15.8 Broker and agency services, and insurance-related services 1.9 12.5 0.5 — 14.9 Asset management, and business services — — — 9.2 9.2 Total $ 1.9 $ 28.3 $ 0.5 $ 9.2 $ 39.9 Primary Geographic Market United States $ 1.9 $ 7.1 $ 0.5 $ 2.0 $ 11.5 International — 21.2 — 7.2 28.4 Total $ 1.9 $ 28.3 $ 0.5 $ 9.2 $ 39.9 Nine Months Ended September 30, 2018 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Major service lines Product warranty registration and service $ — $ 90.7 $ — $ — $ 90.7 Broker and agency services, and insurance-related services 23.7 46.2 1.8 — 71.7 Asset management, and business services — — — 34.4 34.4 Total $ 23.7 $ 136.9 $ 1.8 $ 34.4 $ 196.8 Primary Geographic Market United States $ 23.7 $ 72.0 $ 1.8 $ 9.0 $ 106.5 International — 64.9 — 25.4 90.3 Total $ 23.7 $ 136.9 $ 1.8 $ 34.4 $ 196.8

Divestitures

Divestitures	9 Months Ended
	Sep. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Divestitures	Divestitures On November 3, 2017 , the Company and Mayfield Holdings LLC (“Mayfield”), entered into a Contribution and Stock Purchase Agreement (the “Acquisition Agreement”) with MH JV Holdings L.P. (“Investor”), a newly-formed investment vehicle owned by affiliates of Madison Dearborn Partners, related to the Investor’s acquisition of a majority interest in a portion of the Company's U.S.-based fee business. On February 28, 2018, the Company completed the transfer of the U.S.-based fee businesses to Mayfield and the Investor's acquisition of a majority interest in Mayfield. Under the terms of the Acquisition Agreement, as amended, (1) Investor contributed to Mayfield approximately $225.8 in cash in exchange for approximately 51% of the common units of Mayfield, (2) the Company contributed into Mayfield equity interests in certain of the entities comprising the U.S.-based fee businesses with an implied value of approximately $217.0 in exchange for approximately 49% of the common units of Mayfield, and (3) one or more subsidiaries of Mayfield acquired from the Company the remaining portion of the entities comprising the U.S.-based fee businesses in exchange for a base cash purchase price of approximately $933.0 , subject to post-closing purchase price adjustments based upon the amount of cash, indebtedness, other non-cash adjustments and transaction expenses of Mayfield and its subsidiaries at the closing of the transaction. The Company recognized a $724.1 gain on the sale based on the base cash purchase price during the nine months ended September 30, 2018 . There were no post-closing purchase price adjustments made during the nine months ended September 30, 2018. Now that the transaction has closed, the Company has ceased consolidating the results of the U.S.-based fee businesses within its consolidated financial statements and reports its ownership interest in Mayfield using the equity method of accounting and includes it in other investments on the consolidated balance sheets. During the three and nine months ended September 30, 2018, the Company recognized a loss on its ownership interest in Mayfield of $31.7 , which is included in equity in (loss) earnings of unconsolidated subsidiaries on the consolidated statements of operations. The Company records these results on a one quarter lag. The assets and liabilities related to this transaction were classified as held for sale in the consolidated balance sheets as of December 31, 2017. The Company determined the estimated fair value of the net assets held for sale based on the estimated selling price less costs to sell and was classified as Level 2 within the fair value hierarchy as of December 31, 2017. The classes of assets and liabilities to be sold and classified as held for sale as of December 31, 2017 consisted of the following: December 31, 2017 Fixed maturity securities, available for sale $ 35.3 Other investments 0.2 Cash and cash equivalents 56.1 Restricted cash and cash equivalents 33.8 Accrued interest and dividends 0.3 Premiums receivable, net 33.9 Deferred policy acquisition costs 211.5 Property, equipment and software, net 4.2 Goodwill 188.3 Intangible assets 171.9 Other assets 165.4 Total assets held for sale $ 900.9 Funds held under reinsurance treaties $ 1.3 Accrued expenses and other liabilities 760.4 Total liabilities held for sale $ 761.7 On July 2, 2018 the Company sold its entire equity interest in AMTCS Holdings, Inc., a provider of administrative services for consumer protection products in the U.S. The Company received an immaterial amount of cash consideration and recognized a $7.8 pre-tax loss, which is included in (Loss) gain on sales of U.S.-based fee businesses in the consolidated statements of operations, during the three months ended September 30, 2018. The divestiture of AMTCS Holdings, Inc. will not have a material impact on the Company's operations or financial condition.

Investments (Tables)

Investments (Tables)	9 Months Ended
	Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities	The amortized cost, gross unrealized gains and losses, and estimated fair value of securities classified as available-for-sale as of September 30, 2018 and December 31, 2017 , are presented below: As of September 30, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. treasury securities $ 197.9 $ 0.5 $ (2.1 ) $ 196.3 U.S. government agencies 126.3 0.7 (3.0 ) 124.0 Municipal bonds 881.2 4.7 (15.0 ) 870.9 Foreign government 253.6 0.9 (4.3 ) 250.2 Corporate bonds: Finance 2,090.2 5.2 (38.6 ) 2,056.8 Industrial 2,385.7 8.1 (53.5 ) 2,340.3 Utilities 318.3 2.2 (6.6 ) 313.9 Commercial mortgage-backed securities 386.1 1.4 (16.0 ) 371.5 Residential mortgage-backed securities: Agency backed 1,025.9 0.2 (23.5 ) 1,002.6 Non-agency backed 0.6 0.1 — 0.7 Collateralized loan / debt obligation 951.3 3.3 (4.1 ) 950.5 Asset backed securities 18.9 0.1 — 19.0 Total available-for-sale securities $ 8,636.0 $ 27.4 $ (166.7 ) $ 8,496.7 As of December 31, 2017 (1) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. treasury securities $ 301.6 $ 0.9 $ (3.2 ) $ 299.3 U.S. government agencies 51.1 — (0.6 ) 50.5 Municipal bonds 1,035.5 15.9 (5.9 ) 1,045.5 Foreign government 151.4 3.5 (3.2 ) 151.7 Corporate bonds: Finance 1,733.2 48.1 (11.9 ) 1,769.4 Industrial 2,237.0 57.3 (26.1 ) 2,268.2 Utilities 323.8 10.7 (2.1 ) 332.4 Commercial mortgage-backed securities 419.3 3.8 (10.4 ) 412.7 Residential mortgage-backed securities: Agency backed 562.0 5.8 (11.4 ) 556.4 Non-agency backed 6.9 — (0.1 ) 6.8 Collateralized loan / debt obligation 591.2 9.7 (0.3 ) 600.6 Asset backed securities 30.1 0.1 (0.1 ) 30.1 Less: Assets classified as held for sale (See Note 13) (34.4 ) (0.9 ) — (35.3 ) Total available-for-sale securities $ 7,408.7 $ 154.9 $ (75.3 ) $ 7,488.3 (1) In connection with the adoption of ASU 2016-01, the disclosure for December 31, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01.
Summary of Available for Sale Fixed Securities by Contractual Maturity	A summary of the Company’s available-for-sale securities as of September 30, 2018 and December 31, 2017 , by contractual maturity, is shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. September 30, 2018 December 31, 2017 Amortized Cost Fair Value Amortized Cost Fair Value Due in one year or less $ 273.7 $ 271.8 $ 228.1 $ 226.7 Due after one through five years 2,045.3 2,032.6 1,811.3 1,845.5 Due after five through ten years 3,357.1 3,277.9 3,199.7 3,239.8 Due after ten years 577.1 570.1 594.5 605.0 Mortgage and asset backed securities 2,382.8 2,344.3 1,609.5 1,606.6 Less: Assets classified as held for sale (See Note 13) — — (34.4 ) (35.3 ) Total $ 8,636.0 $ 8,496.7 $ 7,408.7 $ 7,488.3
Summary of Gross Unrealized Losses of Fixed-maturities and Equity Securities	The tables below summarize the gross unrealized losses of the Company's available-for-sale securities by length of time the security has continuously been in an unrealized loss position as of September 30, 2018 and December 31, 2017 : Less Than 12 Months 12 Months or More Total As of September 30, 2018 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. treasury securities $ 7.2 $ (0.1 ) $ 182.6 $ (2.0 ) $ 189.8 $ (2.1 ) U.S. government agencies 75.5 (1.8 ) 27.8 (1.2 ) 103.3 (3.0 ) Municipal bonds 445.0 (8.8 ) 162.9 (6.2 ) 607.9 (15.0 ) Foreign government 185.7 (3.4 ) 17.6 (0.9 ) 203.3 (4.3 ) Corporate bonds: Finance 1,567.0 (32.0 ) 144.7 (6.6 ) 1,711.7 (38.6 ) Industrial 1,552.8 (40.1 ) 229.4 (13.4 ) 1,782.2 (53.5 ) Utilities 204.1 (5.6 ) 23.7 (1.0 ) 227.8 (6.6 ) Commercial mortgage-backed securities 159.9 (6.1 ) 131.0 (9.9 ) 290.9 (16.0 ) Residential mortgage-backed securities: Agency backed 803.9 (15.3 ) 127.8 (8.2 ) 931.7 (23.5 ) Collateralized loan / debt obligations 474.9 (4.1 ) — — 474.9 (4.1 ) Total $ 5,476.0 $ (117.3 ) $ 1,047.5 $ (49.4 ) $ 6,523.5 $ (166.7 ) Less Than 12 Months 12 Months or More Total As of December 31, 2017 (1) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses U.S. treasury securities $ 41.9 $ (0.5 ) $ 247.0 $ (2.7 ) $ 288.9 $ (3.2 ) U.S. government agencies 48.7 (0.6 ) 0.5 — 49.2 (0.6 ) Municipal bonds 171.3 (2.7 ) 178.7 (3.2 ) 350.0 (5.9 ) Foreign government 57.4 (2.2 ) 17.1 (1.0 ) 74.5 (3.2 ) Corporate bonds: Finance 419.3 (9.7 ) 91.5 (2.2 ) 510.8 (11.9 ) Industrial 437.1 (16.4 ) 255.4 (9.7 ) 692.5 (26.1 ) Utilities 72.5 (2.0 ) 11.9 (0.1 ) 84.4 (2.1 ) Commercial mortgage-backed securities 81.5 (4.1 ) 157.5 (6.3 ) 239.0 (10.4 ) Residential mortgage-backed securities: Agency backed 91.7 (4.7 ) 167.8 (6.7 ) 259.5 (11.4 ) Non-agency backed 2.9 — 0.8 (0.1 ) 3.7 (0.1 ) Collateralized loan / debt obligations 56.8 (0.2 ) 4.3 (0.1 ) 61.1 (0.3 ) Asset backed securities 7.1 — 3.1 (0.1 ) 10.2 (0.1 ) Total $ 1,488.2 $ (43.1 ) $ 1,135.6 $ (32.2 ) $ 2,623.8 $ (75.3 ) (1) In connection with the adoption of ASU 2016-01, the disclosure for December 31, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01.
Amortized Cost, Estimated Market Value and Gross Unrealized Appreciation and Depreciation of Trading Securities	The table below shows the portion of trading gains and losses for the period related to trading securities still held during the three months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 (1) 2018 2017 (1) Net gains (losses) recognized during the period on trading securities $ 1.6 $ 1.7 $ (3.4 ) $ (2.9 ) Less: Net losses (gains) recognized during the period on trading securities sold during the period 0.9 1.9 (3.0 ) 4.2 Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date $ 0.7 $ (0.2 ) $ (0.4 ) $ (7.1 ) (1) In connection with the adoption of ASU 2016-01, the disclosure for the three and nine months ended September 30, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01. The amortized cost, gross unrealized gains and losses, and estimated fair value of securities classified as trading as of September 30, 2018 and December 31, 2017 are presented in the tables below: As of September 30, 2018 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Corporate bonds: Industrial $ 3.7 $ — $ (0.5 ) $ 3.2 Total trading securities $ 3.7 $ — $ (0.5 ) $ 3.2 As of December 31, 2017 (1) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Corporate bonds: Industrial $ 26.7 $ 0.1 $ (2.4 ) $ 24.4 Finance 0.5 — — 0.5 U.S. treasury securities 25.0 — (0.1 ) 24.9 Total trading securities $ 52.2 $ 0.1 $ (2.5 ) $ 49.8 (1) In connection with the adoption of ASU 2016-01, the disclosure for December 31, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01. The table below shows the portion of gains and losses for the period related to equity securities still held during the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Net gains (losses) recognized during the period on equity securities $ 2.6 $ (5.3 ) $ 11.3 $ 11.7 Less: Net losses (gains) recognized during the period on equity securities sold during the period 2.2 (2.2 ) 0.8 (7.2 ) Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date $ 0.4 $ (3.1 ) $ 10.5 $ 18.9 The original cost, gross unrealized gains and losses, and estimated fair value of the Company's equity securities as of September 30, 2018 and December 31, 2017 , are presented below: As of September 30, 2018 Original Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Preferred stock $ 0.6 $ — $ — $ 0.6 Common stock 122.6 32.8 (16.7 ) 138.7 Total equity securities $ 123.2 $ 32.8 $ (16.7 ) $ 139.3 As of December 31, 2017 Original Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Preferred stock $ 0.5 $ — $ — $ 0.5 Common stock 195.4 30.6 (14.8 ) 211.2 Total equity securities $ 195.9 $ 30.6 $ (14.8 ) $ 211.7
Net Investment Income	Net investment income for the three and nine months ended September 30, 2018 and 2017 was derived from the following sources: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Fixed maturity securities, available-for-sale $ 62.4 $ 60.5 $ 183.8 $ 187.2 Fixed maturity securities, trading (1.3 ) 0.5 3.5 1.5 Equity securities (1) 0.1 0.3 0.8 1.9 Cash and short term investments 3.9 5.7 12.7 9.0 Other invested assets 6.1 (0.7 ) 12.8 (15.7 ) Total investment income 71.2 66.3 213.6 183.9 Investment expenses and interest expense on securities sold under agreement to repurchase (1.4 ) (5.2 ) (7.3 ) (10.2 ) Net investment income $ 69.8 $ 61.1 $ 206.3 $ 173.7 (1) In connection with the adoption of ASU 2016-01, the disclosure for the three and nine months ended September 30, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01.
Realized Gain (Loss) on Investments	The tables below summarize the gross and net realized gains and (losses) for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, 2018 2017 Gross Gains Gross Losses Net Gains (Losses) Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 23.5 $ (7.6 ) $ 15.9 $ 15.6 $ (1.1 ) $ 14.5 Fixed maturity securities, trading 1.6 — 1.6 1.7 — 1.7 Equity securities (1) 8.5 (5.9 ) 2.6 15.4 (10.6 ) 4.8 Other invested assets — — — 3.5 — 3.5 Other-than-temporary impairment of other invested assets — (4.5 ) (4.5 ) — — — Total $ 33.6 $ (18.0 ) $ 15.6 $ 36.2 $ (11.7 ) $ 24.5 Nine Months Ended September 30, 2018 2017 Gross Gains Gross Losses Net Gains (Losses) Gross Gains Gross Losses Net Gains (Losses) Fixed maturity securities, available-for-sale $ 43.4 $ (23.4 ) $ 20.0 $ 38.0 $ (3.2 ) $ 34.8 Fixed maturity securities, trading 3.0 (6.4 ) (3.4 ) 6.9 (9.8 ) (2.9 ) Equity securities (1) 32.2 (20.9 ) 11.3 36.4 (31.2 ) 5.2 Other invested assets 0.2 — 0.2 19.5 — 19.5 Other-than-temporary impairment of other invested assets — (4.5 ) (4.5 ) — — — Other-than-temporary impairment of fixed maturity securities, available-for-sale — (0.3 ) (0.3 ) — — — Total $ 78.8 $ (55.5 ) $ 23.3 $ 100.8 $ (44.2 ) $ 56.6 (1) In connection with the adoption of ASU 2016-01, the disclosure for the three and nine months ended September 30, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the impact of the adoption of ASU 2016-01.
Fair Values of Restricted Assets	The fair values of the Company's restricted assets as of September 30, 2018 and December 31, 2017 are as follows: September 30, 2018 December 31, 2017 Restricted cash and cash equivalents $ 439.0 $ 480.1 Restricted investments 3,333.4 3,193.8 Total restricted cash, cash equivalents and investments $ 3,772.4 $ 3,673.9

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurement of Financial Assets and Financial Liabilities on Recurring Basis	The following tables present the level within the fair value hierarchy at which the Company’s financial assets and financial liabilities are measured on a recurring basis as of September 30, 2018 and December 31, 2017 : As of September 30, 2018 Total Level 1 Level 2 Level 3 Financial Assets U.S. treasury securities $ 196.3 $ 196.3 $ — $ — U.S. government agencies 124.0 — 124.0 — Municipal bonds 870.9 — 870.0 0.9 Foreign government 250.2 — 250.2 — Corporate bonds and other bonds: Finance 2,056.8 — 2,056.8 — Industrial 2,343.5 — 2,343.5 — Utilities 313.9 — 313.9 — Commercial mortgage-backed securities 371.5 — 351.5 20.0 Residential mortgage-backed securities: Agency backed 1,002.6 — 1,002.6 — Non-agency backed 0.7 — 0.7 — Collateralized loan / debt obligations 950.5 — 950.5 — Asset-backed securities 19.0 — 18.2 0.8 Equity securities 139.3 137.9 0.7 0.7 Short term investments 198.0 — 198.0 — Other investments 4.1 — — 4.1 Life settlement contracts 1.9 — — 1.9 Total financial assets $ 8,843.2 $ 334.2 $ 8,480.6 $ 28.4 Financial Liabilities Securities sold but not yet purchased $ 33.1 $ 33.0 $ 0.1 $ — Securities sold under agreements to repurchase 233.8 — 233.8 — Life settlement contract profit commission 3.0 — — 3.0 Contingent consideration 25.7 — — 25.7 Total financial liabilities $ 295.6 $ 33.0 $ 233.9 $ 28.7 As of December 31, 2017 Total Level 1 Level 2 Level 3 Financial Assets U.S. treasury securities $ 324.2 $ 324.2 $ — $ — U.S. government agencies 50.5 — 50.5 — Municipal bonds 1,045.5 — 1,045.1 0.4 Foreign government 151.7 — 151.7 — Corporate bonds and other bonds: Finance 1,769.9 — 1,769.9 — Industrial 2,292.6 — 2,292.6 — Utilities 332.4 — 332.4 — Commercial mortgage-backed securities 412.7 — 389.8 22.9 Residential mortgage-backed securities: Agency backed 556.4 — 556.4 — Non-agency backed 6.8 — 6.8 — Collateralized loan / debt obligations 600.6 — 600.6 — Asset-backed securities 30.1 — 29.3 0.8 Equity securities 211.7 210.7 0.5 0.5 Short term investments 187.8 — 187.8 — Other investments 5.0 — — 5.0 Life settlement contracts 20.8 — — 20.8 Less: Fixed maturity securities classified as held for sale (see note 13) (35.3 ) — (35.3 ) — Total financial assets (1) $ 7,963.4 $ 534.9 $ 7,378.1 $ 50.4 Financial Liabilities Securities sold but not yet purchased $ 75.5 $ 70.8 $ 4.7 $ — Life settlement contract profit commission 3.2 — — 3.2 Contingent consideration 75.4 — — 75.4 Total financial liabilities (2) $ 154.1 $ 70.8 $ 4.7 $ 78.6 (1) Does not include assets held for sale of $900.9 carried at fair value and classified as Level 2 within the fair value hierarchy as of December 31, 2017. See Note 13. "Divestiture" for additional information. (2) Does not include liabilities held for sale of $761.7 carried at fair value and classified as Level 2 within the fair value hierarchy as of December 31, 2017. See Note 13. "Divestiture" for additional information.
Changes in Fair Value of Level 3 Financial Assets And Liabilities	The following table provides a summary of changes in fair value of the Company’s Level 3 financial assets and liabilities for the three and nine months ended September 30, 2018 and 2017 . The transfers into and out of Level 3 were due to changes in the availability of market observable inputs. All transfers are reflected in the table at fair value as of the end of the reporting period. Balance as of June 30, 2018 Net (loss) Other comprehensive (loss) Purchases and issuances Sales and settlements Net transfers into Level 3 Balance as of September 30, Fixed maturities, available-for-sale $ 23.5 $ — $ (0.9 ) $ — $ (0.9 ) $ — $ 21.7 Equity securities 0.8 (0.1 ) — — — — 0.7 Other investments 4.1 — — — — — 4.1 Life settlement contracts 1.9 — — — — — 1.9 Life settlement contract profit commission (3.2 ) 0.2 — — — — (3.0 ) Contingent consideration (31.2 ) 6.0 — (0.5 ) — — (25.7 ) Total $ (4.1 ) $ 6.1 $ (0.9 ) $ (0.5 ) $ (0.9 ) $ — $ (0.3 ) Balance as of June 30, 2017 Net income (loss) Other comprehensive income (loss) Purchases and issuances Sales and settlements Net transfers into Level 3 Balance as of September 30, Fixed maturities, available-for-sale $ 41.5 $ — $ 0.2 $ 2.0 $ (1.2 ) $ (8.4 ) $ 34.1 Equity securities 23.5 0.6 (0.5 ) — (21.5 ) (0.4 ) 1.7 Life settlement contracts 396.8 33.6 — — (131.7 ) — 298.7 Life settlement contract profit commission (5.7 ) (0.2 ) — — — — (5.9 ) Contingent consideration (97.7 ) 3.3 — (1.9 ) 11.8 — (84.5 ) Total $ 358.4 $ 37.3 $ (0.3 ) $ 0.1 $ (142.6 ) $ (8.8 ) $ 244.1 Balance as of December 31, 2017 Net (loss) income Other comprehensive (loss) Purchases and issuances Sales and settlements Net transfers into Level 3 Balance as of September 30, Fixed maturities, available-for-sale $ 24.1 $ (0.3 ) $ (0.1 ) $ — $ (2.0 ) $ — $ 21.7 Equity securities 0.5 0.2 — — — — 0.7 Other investments 5.0 (0.5 ) — — (0.4 ) — 4.1 Life settlement contracts 20.8 2.3 — — (21.2 ) — 1.9 Life settlement contract profit commission (3.2 ) 0.2 — — — — (3.0 ) Contingent consideration (75.4 ) 7.1 — (0.5 ) 43.1 — (25.7 ) Total $ (28.2 ) $ 9.0 $ (0.1 ) $ (0.5 ) $ 19.5 $ — $ (0.3 ) Balance as of December 31, 2016 Net income (loss) Other comprehensive (loss) Purchases and issuances Sales and settlements Net transfers into Level 3 Balance as of September 30, Fixed maturities, available-for-sale $ 46.9 $ — $ (0.3 ) $ 9.5 $ (4.0 ) $ (18.0 ) $ 34.1 Equity securities 24.4 0.2 (0.2 ) 4.6 (40.3 ) 13.0 1.7 Life settlement contracts 356.9 82.2 — 16.5 (156.9 ) — 298.7 Life settlement contract profit commission (4.9 ) (1.0 ) — — — — (5.9 ) Contingent consideration (71.7 ) (0.4 ) — (29.0 ) 16.6 — (84.5 ) Total $ 351.6 $ 81.0 $ (0.5 ) $ 1.6 $ (184.6 ) $ (5.0 ) $ 244.1
Fair Value Measurements, Recurring and Nonrecurring	The fair value of the Company's debt arrangements as of September 30, 2018 was as follows: September 30, 2018 Carrying Value Fair Value Revolving credit facility $ 130.0 $ 130.0 5.5% Convertible senior notes due 2021 5.5 5.5 2.75% Convertible senior notes due 2044 178.2 219.5 6.125% Senior notes due 2023 248.7 243.9 Junior subordinated debentures due 2035-2037 122.2 108.5 Trust preferred securities due 2033-2037 92.8 86.5 7.25% Subordinated Notes due 2055 145.4 140.9 7.50% Subordinated Notes due 2055 130.9 131.0 Secured loan agreements 158.5 158.5 Promissory notes and other 112.8 112.8 Total debt $ 1,325.0 $ 1,337.1

Loss and loss adjustment expe_2

Loss and loss adjustment expense reserves (Tables)	9 Months Ended
	Sep. 30, 2018
Insurance [Abstract]
Schedule of Liability for Unpaid Claims and Claims Adjustment Expense	The following table provides a reconciliation of the beginning and ending balances for loss and loss adjustment expense ("Loss and LAE") reserves for the nine months ended September 30, 2018 , and 2017 , respectively: Nine Months Ended September 30, 2018 2017 Loss and LAE reserves, gross of related reinsurance recoverables at beginning of year $ 12,138.8 $ 10,140.7 Less: Reinsurance recoverables at beginning of year 5,669.6 3,873.8 Net balance, beginning of year 6,469.2 6,266.9 Incurred related to: Current year 2,927.1 2,712.0 Prior year 42.7 418.9 Total incurred during the period 2,969.8 3,130.9 Paid related to: Current year (778.0 ) (699.3 ) Prior year (1,731.9 ) (1,593.6 ) Total paid during the period (2,509.9 ) (2,292.9 ) Acquired loss and loss adjustment reserves and other 8.3 200.8 Retroactive reinsurance adjustment 18.7 (1,025.0 ) Effect of foreign exchange rates (76.8 ) 138.3 Net balance, end of period 6,879.3 6,419.0 Plus reinsurance recoverables at end of period 5,671.9 5,667.6 Loss and LAE reserves, at end of period $ 12,551.2 $ 12,086.6

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2018
Debt Disclosure [Abstract]
Borrowings	The Company’s outstanding debt consisted of the following at September 30, 2018 and December 31, 2017 : September 30, 2018 December 31, 2017 Revolving credit facility $ 130.0 $ 130.0 5.5% Convertible senior notes due 2021 (the "2021 Notes") 5.5 5.4 2.75% Convertible senior notes due 2044 (the "2044 Notes") 178.2 173.0 6.125% Notes due 2023 (the "2023 Notes") 248.7 248.4 Junior subordinated debentures (the "2035-2037 Notes") 122.2 122.1 Trust preferred securities (the "2033-2037 TPS Notes") 92.8 92.8 7.25% Subordinated notes due 2055 (the "7.25% 2055 Notes") 145.4 145.3 7.50% Subordinated notes due 2055 (the "7.50% 2055 Notes") 130.9 130.8 Secured loan agreements 158.5 174.4 Promissory notes and other 112.8 66.5 Total debt $ 1,325.0 $ 1,288.7
Schedule of Line of Credit Facilities	Additionally, the Company utilizes various letters of credit in its operations. The following is a summary of the Company's letters of credit as of September 30, 2018 : Limit Outstanding Available Revolving credit facility $ 175.0 $ 173.9 $ 1.1 Funds at Lloyd's facility 592.9 564.3 28.6 ING Bank N.V., BHF Bank Aktiengesellschaft, and Deutsche Bank AG facilities 100.6 97.1 3.5 Comerica Bank facility 75.0 48.8 26.2 Other letters of credit, in aggregate 114.0 114.0 —
Interest Income and Interest Expense Disclosure	Interest expense, including amortization of original issue discount and deferred origination costs, as well as applicable bank fees, related to the Company's outstanding debt and letters of credit for the three and nine months ended September 30, 2018 and 2017 was: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Revolving credit facility $ 1.9 $ 1.6 $ 5.3 $ 4.6 2021 Notes 0.2 0.2 0.4 0.4 2044 Notes 3.4 3.3 10.1 9.7 2023 Notes 3.9 3.9 11.7 11.7 2035-2037 Notes 1.8 1.4 5.1 4.3 2033-2037 TPS Notes 1.4 1.1 3.9 3.2 7.25% 2055 Notes 2.8 2.8 8.3 8.3 7.50% 2055 Notes 2.6 2.6 7.7 7.7 Secured loan agreements 1.6 1.7 4.9 4.5 Promissory notes 1.1 0.9 2.8 3.6 Funds at Lloyd's facility 1.3 1.4 4.1 4.1 Other, including interest income 0.9 2.0 3.3 8.6 Total $ 22.9 $ 22.9 $ 67.6 $ 70.7

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Summary of elements used in calculating basic and diluted earnings per share	The following table is a summary of the elements used in calculating basic and diluted earnings per share for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 Numerator: Net (loss) income attributable to AmTrust common stockholders $ (84.5 ) $ (174.7 ) $ 461.1 $ (146.2 ) Denominator: Weighted average common shares outstanding – basic 197.6 195.9 196.9 182.6 Plus: Dilutive effect of stock options, convertible debt, other (1) — — 0.4 — Weighted average common shares outstanding – dilutive 197.6 195.9 197.3 182.6 Net (loss) income per AmTrust common share – basic $ (0.43 ) $ (0.89 ) $ 2.34 $ (0.80 ) Net (loss) income per AmTrust common share – diluted $ (0.43 ) $ (0.89 ) $ 2.34 $ (0.80 ) (1) In accordance with ASC 260, Earnings Per Share, no potential common shares are included in the computation of diluted per share amounts as the effect would be antidilutive for the three months ended September 30, 2018 and the three and nine months ended September 30, 2017.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Ownership components of total equity	The following tables summarize the activities and components of stockholders' equity: Common Stock Preferred Stock Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income (Loss) Retained Earnings Total AmTrust Financial Services, Inc. equity Non-controlling interest Total stockholders’ equity Balance, December 31, 2017 $ 2.1 $ 913.7 $ 1,639.6 $ (242.1 ) $ 15.5 $ 860.9 $ 3,189.7 $ 178.4 $ 3,368.1 Net cumulative effect adjustments — — — — (0.7 ) 0.7 — — — Net income (loss) — — — — — 678.4 678.4 (2.5 ) 675.9 Unrealized holding gain, net of tax — — — — (124.7 ) — (124.7 ) — (124.7 ) Reclassification adjustment — — — — (1.6 ) — (1.6 ) — (1.6 ) Foreign currency translation — — — — 62.2 — 62.2 (0.5 ) 61.7 Share exercises, compensation and other — — 1.3 1.6 — — 2.9 — 2.9 Common stock dividends — — — — — (33.4 ) (33.4 ) — (33.4 ) Preferred stock dividends — — — — — (16.6 ) (16.6 ) — (16.6 ) Balance, March 31, 2018 2.1 913.7 1,640.9 (240.5 ) (49.3 ) 1,490.0 3,756.9 175.4 3,932.3 Net (loss) — — — — — (99.7 ) (99.7 ) (3.8 ) (103.5 ) Unrealized holding gain, net of tax — — — — (12.2 ) — (12.2 ) — (12.2 ) Reclassification adjustment — — — — (2.5 ) — (2.5 ) — (2.5 ) Foreign currency translation — — — — (86.6 ) — (86.6 ) 0.5 (86.1 ) Distribution of non-controlling interest — — — — — — — (114.6 ) (114.6 ) Share exercises, compensation and other — — (18.1 ) 22.3 — — 4.2 — 4.2 Preferred stock dividends — — — — — (16.5 ) (16.5 ) — (16.5 ) Balance, June 30, 2018 2.1 913.7 1,622.8 (218.2 ) (150.6 ) 1,373.8 3,543.6 57.5 3,601.1 Net (loss) — — — — — (67.9 ) (67.9 ) (2.8 ) (70.7 ) Unrealized holding gain, net of tax — — — — (16.9 ) — (16.9 ) — (16.9 ) Reclassification adjustment — — — — (15.9 ) — (15.9 ) — (15.9 ) Foreign currency translation — — — — (29.0 ) — (29.0 ) — (29.0 ) Share exercises, compensation and other — — 4.9 2.3 — — 7.2 — 7.2 Preferred stock dividends — — — — — (16.6 ) (16.6 ) — (16.6 ) Balance, September 30, 2018 $ 2.1 $ 913.7 $ 1,627.7 $ (215.9 ) $ (212.4 ) $ 1,289.3 $ 3,404.5 $ 54.7 $ 3,459.2 Common Stock Preferred Stock Additional Paid-in Capital Treasury Stock Accumulated Other Comprehensive Income (Loss) Retained Earnings Total AmTrust Financial Services, Inc. equity Non-controlling interest Total stockholders’ equity Balance, December 31, 2016 $ 2.0 $ 913.7 $ 1,385.0 $ (310.9 ) $ (125.8 ) $ 1,405.1 $ 3,269.1 $ 196.5 $ 3,465.6 Net income — — — — — 39.2 39.2 10.7 49.9 Unrealized holding gain, net of tax — — — — 25.6 — 25.6 — 25.6 Reclassification adjustment — — — — (11.6 ) — (11.6 ) — (11.6 ) Foreign currency translation — — — — 13.9 — 13.9 — 13.9 Unrealized gain on interest rate swap — — — — 0.1 — 0.1 — 0.1 Share exercises, compensation and other — — 1.4 4.5 — — 5.9 — 5.9 Common stock dividends — — — — — (29.1 ) (29.1 ) — (29.1 ) Preferred stock dividends — — — — — (16.6 ) (16.6 ) — (16.6 ) Capital distributions, net — — — — — — — 8.6 8.6 Balance, March 31, 2017 2.0 913.7 1,386.4 (306.4 ) (97.8 ) 1,398.6 3,296.5 215.8 3,512.3 Net income — — — — — 22.4 22.4 6.4 28.8 Unrealized holding gain, net of tax — — — — 49.5 — 49.5 — 49.5 Reclassification adjustment — — — — (19.3 ) — (19.3 ) — (19.3 ) Foreign currency translation — — — — 62.7 — 62.7 — 62.7 Share exercises, compensation and other — — 1.0 3.0 — — 4.0 — 4.0 Common stock issuance 0.1 — 238.6 59.9 — — 298.6 — 298.6 Common stock dividends — — — — — (34.1 ) (34.1 ) — (34.1 ) Preferred stock dividends — — — — — (16.5 ) (16.5 ) — (16.5 ) Capital distributions, net — — — — — — — 10.7 10.7 Balance, June 30, 2017 2.1 913.7 1,626.0 (243.5 ) (4.9 ) 1,370.4 3,663.8 232.9 3,896.7 Net (loss) — — — — — (158.1 ) (158.1 ) (1.0 ) (159.1 ) Unrealized holding gain, net of tax — — — — 19.8 — 19.8 — 19.8 Reclassification adjustment — — — — (23.3 ) — (23.3 ) — (23.3 ) Foreign currency translation — — — — 50.6 — 50.6 — 50.6 Unrealized gain on interest rate swap — — — — 0.1 — 0.1 — 0.1 Share exercises, compensation and other — — 8.1 1.3 — — 9.4 — 9.4 Common stock dividends — — — — — (32.5 ) (32.5 ) — (32.5 ) Preferred stock dividends — — — — — (16.6 ) (16.6 ) — (16.6 ) Capital distributions, net — — — — — — — (50.6 ) (50.6 ) Balance, September 30, 2017 $ 2.1 $ 913.7 $ 1,634.1 $ (242.2 ) $ 42.3 $ 1,163.2 $ 3,513.2 $ 181.3 $ 3,694.5
Schedule of AOCI	The following tables summarize the activities and components of accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2018 and 2017: Foreign Currency Items Unrealized Gains (Losses) on Investments Interest Rate Swap Hedge Net Benefit Plan Assets and Obligations Recognized in Stockholders' Equity Accumulated Other Comprehensive (Loss) Income Balance, June 30, 2018 $ (69.2 ) $ (79.1 ) $ — $ (2.3 ) $ (150.6 ) Other comprehensive loss before reclassification (29.0 ) (24.9 ) — — (53.9 ) Amounts reclassed out of accumulated other comprehensive loss — (15.9 ) — — (15.9 ) Income tax benefit — 8.0 — — 8.0 Net current-period other comprehensive loss (29.0 ) (32.8 ) — — (61.8 ) Balance, September 30, 2018 $ (98.2 ) $ (111.9 ) $ — $ (2.3 ) $ (212.4 ) Balance, June 30, 2017 $ (111.6 ) $ 110.0 $ (0.1 ) $ (3.2 ) $ (4.9 ) Other comprehensive income before reclassification 50.6 17.1 0.1 — 67.8 Amounts reclassed out of accumulated other comprehensive income — (23.3 ) — — (23.3 ) Income tax benefit — 2.7 — — 2.7 Net current-period other comprehensive income (loss) 50.6 (3.5 ) 0.1 — 47.2 Balance, September 30, 2017 $ (61.0 ) $ 106.5 $ — $ (3.2 ) $ 42.3 Foreign Currency Items Unrealized Gains (Losses) on Investments Interest Rate Swap Hedge Net Benefit Plan Assets and Obligations Recognized in Stockholders' Equity Accumulated Other Comprehensive Income (Loss) Balance, December 31, 2017 $ (44.8 ) $ 62.6 $ — $ (2.3 ) $ 15.5 Net cumulative effect adjustments (1) — (0.7 ) — — (0.7 ) Other comprehensive loss before reclassification (53.4 ) (199.8 ) — — (253.2 ) Amounts reclassed out of accumulated other comprehensive loss — (20.0 ) — — (20.0 ) Income tax benefit — 46.0 — — 46.0 Net current-period other comprehensive loss (53.4 ) (174.5 ) — — (227.9 ) Balance, September 30, 2018 $ (98.2 ) $ (111.9 ) $ — $ (2.3 ) $ (212.4 ) Balance, December 31, 2016 $ (188.2 ) $ 65.8 $ (0.2 ) $ (3.2 ) $ (125.8 ) Other comprehensive income before reclassification 127.2 115.1 0.2 — 242.5 Amounts reclassed out of accumulated other comprehensive income — (54.1 ) — — (54.1 ) Income tax expense — (20.3 ) — — (20.3 ) Net current-period other comprehensive income 127.2 40.7 0.2 — 168.1 Balance, September 30, 2017 $ (61.0 ) $ 106.5 $ — $ (3.2 ) $ 42.3 (1) See Note 2. "Recent Accounting Pronouncements" for additional information on the adoptions of ASU 2016-01 and ASU 2018-02.

Segments (Tables)

Segments (Tables)	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Summary of earned premium	The following tables summarize the results of operations of the business segments for the three and nine months ended September 30, 2018 and 2017 : Three Months Ended September 30, 2018 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Revenues: Net earned premiums $ 646.5 $ 685.2 $ 93.5 $ — $ 1,425.2 Losses and expenses: Loss and loss adjustment expenses 473.3 474.2 115.7 — 1,063.2 Amortization of deferred acquisition costs 145.8 129.9 22.0 — 297.7 Underwriting, general and administrative expenses 77.2 82.7 11.1 — 171.0 Total losses and expenses 696.3 686.8 148.8 — 1,531.9 Underwriting loss (49.8 ) (1.6 ) (55.3 ) — (106.7 ) Other income (losses and expenses): Service and fee income 3.5 31.4 0.5 17.1 52.5 Investment income and realized gain on investments 38.0 33.2 14.2 — 85.4 Other expenses (18.5 ) (19.4 ) (3.9 ) (40.6 ) (82.4 ) Interest expense (10.8 ) (10.0 ) (2.1 ) — (22.9 ) Foreign currency gain — 14.0 — — 14.0 Other (expenses) revenues (2.0 ) (1.4 ) (0.3 ) 3.3 (0.4 ) Benefit (provision) for income taxes 17.2 (19.8 ) 10.5 13.6 21.5 Equity in (loss) earnings of unconsolidated subsidiaries — — — (31.7 ) (31.7 ) Net (loss) income $ (22.4 ) $ 26.4 $ (36.4 ) $ (38.3 ) $ (70.7 ) Three Months Ended September 30, 2017 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Revenues: Net earned premiums $ 529.1 $ 482.8 $ 181.0 $ — $ 1,192.9 Losses and expenses: Loss and loss adjustment expenses 546.2 458.3 261.6 — 1,266.1 Amortization of deferred acquisition costs 109.8 18.4 41.0 — 169.2 Underwriting, general and administrative expenses 74.7 67.6 25.6 — 167.9 Total losses and expenses 730.7 544.3 328.2 — 1,603.2 Underwriting loss (201.6 ) (61.5 ) (147.2 ) — (410.3 ) Other income (losses and expenses): Service and fee income 27.6 114.5 0.5 37.9 180.5 Investment income and realized gain on investments 33.0 33.5 19.1 — 85.6 Other expenses (45.2 ) (33.5 ) (10.0 ) (88.7 ) (177.4 ) Interest expense (11.7 ) (8.7 ) (2.5 ) — (22.9 ) Foreign currency loss — (62.8 ) — — (62.8 ) Other (expenses) revenues (0.5 ) (0.1 ) (0.1 ) 186.6 185.9 Benefit (provision) for income taxes 65.0 (39.2 ) 75.7 (38.9 ) 62.6 Net (loss) income $ (133.4 ) $ (57.8 ) $ (64.5 ) $ 96.9 $ (158.8 ) Nine Months Ended September 30, 2018 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Revenues: Net earned premiums $ 1,913.4 $ 1,840.4 $ 312.5 $ — $ 4,066.3 Losses and expenses: Loss and loss adjustment expenses 1,450.0 1,223.4 296.4 — 2,969.8 Amortization of deferred acquisition costs 392.1 350.4 77.1 — 819.6 Underwriting, general and administrative expenses 239.4 230.3 39.1 — 508.8 Total losses and expenses 2,081.5 1,804.1 412.6 — 4,298.2 Underwriting income (168.1 ) 36.3 (100.1 ) — (231.9 ) Other income (losses and expenses): Service and fee income 29.4 133.9 1.8 52.8 217.9 Investment income and realized gain on investments 101.5 90.7 37.4 — 229.6 Other expenses (104.1 ) (81.4 ) (17.7 ) (203.1 ) (406.3 ) Interest expense (34.6 ) (27.1 ) (5.9 ) — (67.6 ) Foreign currency gain — 28.9 — — 28.9 Other revenues 0.7 0.6 0.1 727.5 728.9 Benefit (provision) for income taxes 15.1 (15.7 ) 7.3 33.8 40.5 Equity in (loss) earnings of unconsolidated subsidiaries — — — (31.7 ) (31.7 ) Net (loss) income $ (160.1 ) $ 166.2 $ (77.1 ) $ 579.3 $ 508.3 Nine Months Ended September 30, 2017 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Revenues: Net earned premiums $ 1,714.6 $ 1,495.3 $ 586.2 $ — $ 3,796.1 Losses and expenses: Loss and loss adjustment expenses 1,390.5 1,141.8 598.6 — 3,130.9 Amortization of deferred acquisition costs 339.1 83.3 165.3 — 587.7 Underwriting, general and administrative expenses 203.6 177.6 69.6 — 450.8 Total losses and expenses 1,933.2 1,402.7 833.5 — 4,169.4 Underwriting (loss) gain (218.6 ) 92.6 (247.3 ) — (373.3 ) Other income (losses and expenses): Service and fee income 87.2 299.6 2.5 97.1 486.4 Investment income and realized gain on investments 95.2 87.4 47.7 — 230.3 Other expenses (141.9 ) (95.6 ) (32.6 ) (270.0 ) (540.1 ) Interest expense (37.2 ) (25.0 ) (8.5 ) — (70.7 ) Foreign currency loss — (139.7 ) — — (139.7 ) Other revenues 3.4 2.3 0.8 186.6 193.1 Benefit (provision) for income taxes 64.6 (42.3 ) 76.6 (37.9 ) 61.0 Equity in earnings of unconsolidated subsidiary – related party — — — 73.5 73.5 Net (loss) income $ (147.3 ) $ 179.3 $ (160.8 ) $ 49.3 $ (79.5 ) The following table summarizes net earned premiums by major line of business, by segment, for the three and nine months ended September 30, 2018 and 2017 : Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Three Months Ended September 30, 2018: Workers' compensation $ 369.4 $ — $ 40.4 $ 409.8 Warranty — 266.0 — 266.0 Commercial auto and liability, physical damage 124.9 — 26.1 151.0 Commercial multiple-peril 90.2 11.9 7.4 109.5 Other liabilities — 89.6 15.0 104.6 Medical malpractice — 56.0 — 56.0 Accident and health — 45.5 — 45.5 Surety 16.1 22.2 — 38.3 Homeowners multiple-peril 11.4 20.1 0.9 32.4 Fire 1.8 41.7 — 43.5 Inland Marine 2.0 23.1 — 25.1 Crop — 74.2 — 74.2 Other 30.7 34.9 3.7 69.3 Total net earned premiums $ 646.5 $ 685.2 $ 93.5 $ 1,425.2 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Three Months Ended September 30, 2017: Workers' compensation $ 339.6 $ — $ 84.4 $ 424.0 Warranty 0.9 242.2 — 243.1 Commercial auto and liability, physical damage 76.8 — 34.4 111.2 Commercial multiple-peril 84.0 — 11.8 95.8 Other liabilities — 37.5 48.6 86.1 Medical malpractice — 60.9 — 60.9 Accident and health — 27.5 — 27.5 Surety 13.7 31.3 — 45.0 Homeowners multiple-peril 7.5 2.6 0.2 10.3 Fire 2.7 30.2 — 32.9 Inland Marine 1.2 7.1 0.2 8.5 Crop — 28.2 — 28.2 Other 2.7 15.3 1.4 19.4 Total net earned premiums $ 529.1 $ 482.8 $ 181.0 $ 1,192.9 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Nine Months Ended September 30, 2018: Workers' compensation $ 1,124.3 $ — $ 151.2 $ 1,275.5 Warranty — 797.8 — 797.8 Commercial auto and liability, physical damage 363.5 — 80.7 444.2 Commercial multiple-peril 254.9 37.8 28.2 320.9 Other liabilities — 225.6 34.4 260.0 Medical malpractice — 160.4 — 160.4 Accident and health — 128.9 — 128.9 Surety 45.6 64.7 — 110.3 Homeowners multiple-peril 24.5 76.6 3.4 104.5 Fire 5.2 95.0 — 100.2 Inland Marine 5.3 61.6 — 66.9 Crop — 79.7 — 79.7 Other 90.1 112.3 14.6 217.0 Total net earned premiums $ 1,913.4 $ 1,840.4 $ 312.5 $ 4,066.3 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Total Nine Months Ended September 30, 2017: Workers' compensation $ 1,049.0 $ — $ 308.0 $ 1,357.0 Warranty 0.9 683.1 — 684.0 Commercial auto and liability, physical damage 273.5 — 88.9 362.4 Commercial multiple-peril 182.2 1.7 27.8 211.7 Other liabilities — 144.8 155.3 300.1 Medical malpractice — 167.6 — 167.6 Accident and health — 106.6 — 106.6 Surety 39.8 83.6 0.1 123.5 Homeowners multiple-peril 33.1 32.0 2.9 68.0 Fire 22.8 156.6 0.8 180.2 Inland Marine 4.2 24.9 1.3 30.4 Crop — 29.9 — 29.9 Other 109.1 64.5 1.1 174.7 Total net earned premiums $ 1,714.6 $ 1,495.3 $ 586.2 $ 3,796.1
Disaggregation of revenue	The following table presents the Company's revenues from contracts with customers disaggregated by major business activity and primary geographic regions for the three and nine months ended September 30, 2018 : Three Months Ended September 30, 2018 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Major service lines Product warranty registration and service $ — $ 15.8 $ — $ — $ 15.8 Broker and agency services, and insurance-related services 1.9 12.5 0.5 — 14.9 Asset management, and business services — — — 9.2 9.2 Total $ 1.9 $ 28.3 $ 0.5 $ 9.2 $ 39.9 Primary Geographic Market United States $ 1.9 $ 7.1 $ 0.5 $ 2.0 $ 11.5 International — 21.2 — 7.2 28.4 Total $ 1.9 $ 28.3 $ 0.5 $ 9.2 $ 39.9 Nine Months Ended September 30, 2018 Small Commercial Business Specialty Risk and Extended Warranty Specialty Program Corporate and Other Total Major service lines Product warranty registration and service $ — $ 90.7 $ — $ — $ 90.7 Broker and agency services, and insurance-related services 23.7 46.2 1.8 — 71.7 Asset management, and business services — — — 34.4 34.4 Total $ 23.7 $ 136.9 $ 1.8 $ 34.4 $ 196.8 Primary Geographic Market United States $ 23.7 $ 72.0 $ 1.8 $ 9.0 $ 106.5 International — 64.9 — 25.4 90.3 Total $ 23.7 $ 136.9 $ 1.8 $ 34.4 $ 196.8

Divestitures (Tables)

Divestitures (Tables)	9 Months Ended
	Sep. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Classes of Assets and Liabilities to be Sold and Classified as Held for Sale	The classes of assets and liabilities to be sold and classified as held for sale as of December 31, 2017 consisted of the following: December 31, 2017 Fixed maturity securities, available for sale $ 35.3 Other investments 0.2 Cash and cash equivalents 56.1 Restricted cash and cash equivalents 33.8 Accrued interest and dividends 0.3 Premiums receivable, net 33.9 Deferred policy acquisition costs 211.5 Property, equipment and software, net 4.2 Goodwill 188.3 Intangible assets 171.9 Other assets 165.4 Total assets held for sale $ 900.9 Funds held under reinsurance treaties $ 1.3 Accrued expenses and other liabilities 760.4 Total liabilities held for sale $ 761.7 On July 2, 2018 the Company sold its entire equity interest in AMTCS Holdings, Inc., a provider of administrative services for consumer protection products in the U.S. The Company received an immaterial amount of cash consideration and recognized a $7.8 pre-tax loss, which is included in (Loss) gain on sales of U.S.-based fee businesses in the consolidated statements of operations, during the three months ended September 30, 2018. The divestiture of AMTCS Holdings, Inc. will not have a material impact on the Company's operations or financial condition.

Basis of Reporting and Merger_2

Basis of Reporting and Merger Agreement - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Mar. 01, 2018	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Common stock, par value (usd per share)	$ 0.01	$ 0.01	$ 0.01
Evergreen Parent
Business Acquisition [Line Items]
Merger consideration share price (usd per share)	$ 14.75
Stone Point | Evergreen Parent
Business Acquisition [Line Items]
Equity interest exchanged in acquisition	$ 800
Entity Controlled By Karfunkel-Zyskind Family | Evergreen Parent
Business Acquisition [Line Items]
Equity interest exchanged in acquisition	400
Enstar | Evergreen Parent
Business Acquisition [Line Items]
Equity interest exchanged in acquisition	200
MDP | Evergreen Parent
Business Acquisition [Line Items]
Equity interest exchanged in acquisition	$ 150
Karfunkel-Zyskind Family
Business Acquisition [Line Items]
Ownership interest	55.00%

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from contracts with customers	$ 39.9	$ 196.8
Revenue from contracts with customers, percentage of total revenues	5.00%	5.00%
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustments			$ (0.7)
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustments			16
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustments			(16.7)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustments			0.7
Retained Earnings | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustments			(16)
Retained Earnings | Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cumulative effect adjustments			$ 16.7

Investments - Available-for-sal

Investments - Available-for-sale (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Total	$ 8,636	$ 7,408.7
Gross Unrealized Gains	27.4	154.9
Gross Unrealized Losses	(166.7)	(75.3)
Fair Value	8,496.7	7,488.3
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Total	197.9	301.6
Gross Unrealized Gains	0.5	0.9
Gross Unrealized Losses	(2.1)	(3.2)
Fair Value	196.3	299.3
U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Total	126.3	51.1
Gross Unrealized Gains	0.7	0
Gross Unrealized Losses	(3)	(0.6)
Fair Value	124	50.5
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total	881.2	1,035.5
Gross Unrealized Gains	4.7	15.9
Gross Unrealized Losses	(15)	(5.9)
Fair Value	870.9	1,045.5
Foreign government
Debt Securities, Available-for-sale [Line Items]
Total	253.6	151.4
Gross Unrealized Gains	0.9	3.5
Gross Unrealized Losses	(4.3)	(3.2)
Fair Value	250.2	151.7
Finance | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total	2,090.2	1,733.2
Gross Unrealized Gains	5.2	48.1
Gross Unrealized Losses	(38.6)	(11.9)
Fair Value	2,056.8	1,769.4
Industrial | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total	2,385.7	2,237
Gross Unrealized Gains	8.1	57.3
Gross Unrealized Losses	(53.5)	(26.1)
Fair Value	2,340.3	2,268.2
Utilities | Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Total	318.3	323.8
Gross Unrealized Gains	2.2	10.7
Gross Unrealized Losses	(6.6)	(2.1)
Fair Value	313.9	332.4
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Total	386.1	419.3
Gross Unrealized Gains	1.4	3.8
Gross Unrealized Losses	(16)	(10.4)
Fair Value	371.5	412.7
Agency backed | Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Total	1,025.9	562
Gross Unrealized Gains	0.2	5.8
Gross Unrealized Losses	(23.5)	(11.4)
Fair Value	1,002.6	556.4
Non-agency backed | Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Total	0.6	6.9
Gross Unrealized Gains	0.1	0
Gross Unrealized Losses	0	(0.1)
Fair Value	0.7	6.8
Collateralized loan / debt obligation
Debt Securities, Available-for-sale [Line Items]
Total	951.3	591.2
Gross Unrealized Gains	3.3	9.7
Gross Unrealized Losses	(4.1)	(0.3)
Fair Value	950.5	600.6
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Total	18.9	30.1
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	0	(0.1)
Fair Value	19	30.1
Disposal Group, Held-for-sale, Not Discontinued Operations | US Based Fee Businesses
Debt Securities, Available-for-sale [Line Items]
Total	0	34.4
Gross Unrealized Gains		0.9
Gross Unrealized Losses		0
Fair Value	$ 0	$ 35.3

Investments - Additional Inform

Investments - Additional Information (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)Investmentagreement	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)Investmentagreement	Sep. 30, 2017USD ($)		Dec. 31, 2017USD ($)Investment
Investment [Line Items]
Fixed maturity securities, available-for-sale (includes maturities & paydowns)	$ 763.8	$ 715.9	$ 1,842.9	$ 1,704.2	[1]
Number of securities | Investment	3,832		3,832			2,086
Continuous unrealized loss position, 12 months or longer, accumulated loss	$ 49.4		$ 49.4			$ 32.2
Continuous unrealized loss position, 12 months or longer, accumulated loss, greater or equal to 20% of amortized cost			0.5
Proceeds from sale of trading securities	165.6	70.5	448.5	379.9
Equity securities	70.8	$ 41.8	252.5	$ 193.5	[1]
Securities sold but not yet purchased, at fair value	$ 33.1		$ 33.1			75.5
Number of repurchase agreements outstanding | agreement	14		14
Securities sold under agreements to repurchase	$ 233.8		$ 233.8			0
Collateral pledged	248.5		248.5
Equity securities
Investment [Line Items]
Securities sold but not yet purchased, at fair value	$ 33.1		$ 33.1			$ 75.5
Minimum
Investment [Line Items]
Securities sold under agreements to repurchase, interest rate	2.20%		2.20%
Maximum
Investment [Line Items]
Securities sold under agreements to repurchase, interest rate	2.70%		2.70%
[1]	In connection with the adoption of ASU 2016-18, the disclosure for the nine months ended September 30, 2017 has been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the adoption of ASU 2016-18.

Investments - Summary of Availa

Investments - Summary of Available for Sale Fixed Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Rolling Maturity [Abstract]
Due in one year or less	$ 273.7	$ 228.1
Due after one through five years	2,045.3	1,811.3
Due after five through ten years	3,357.1	3,199.7
Due after ten years	577.1	594.5
Mortgage and asset backed securities	2,382.8	1,609.5
Total	8,636	7,408.7
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Due in one year or less	271.8	226.7
Due after one through five years	2,032.6	1,845.5
Due after five through ten years	3,277.9	3,239.8
Due after ten years	570.1	605
Mortgage and asset backed securities	2,344.3	1,606.6
Total	8,496.7	7,488.3
Disposal Group, Held-for-sale, Not Discontinued Operations | US Based Fee Businesses
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost, Rolling Maturity [Abstract]
Total	0	34.4
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Total	$ 0	$ 35.3

Investments - Summary of Gross

Investments - Summary of Gross Unrealized Losses of Fixed-maturities and Equity Securities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Fair Value
Less Than 12 Months	$ 5,476	$ 1,488.2
12 Months or More	1,047.5	1,135.6
Total	6,523.5	2,623.8
Unrealized Losses
Less Than 12 Months	(117.3)	(43.1)
12 Months or More	(49.4)	(32.2)
Total	(166.7)	(75.3)
U.S. treasury securities
Fair Value
Less Than 12 Months	7.2	41.9
12 Months or More	182.6	247
Total	189.8	288.9
Unrealized Losses
Less Than 12 Months	(0.1)	(0.5)
12 Months or More	(2)	(2.7)
Total	(2.1)	(3.2)
U.S. government agencies
Fair Value
Less Than 12 Months	75.5	48.7
12 Months or More	27.8	0.5
Total	103.3	49.2
Unrealized Losses
Less Than 12 Months	(1.8)	(0.6)
12 Months or More	(1.2)	0
Total	(3)	(0.6)
Municipal bonds
Fair Value
Less Than 12 Months	445	171.3
12 Months or More	162.9	178.7
Total	607.9	350
Unrealized Losses
Less Than 12 Months	(8.8)	(2.7)
12 Months or More	(6.2)	(3.2)
Total	(15)	(5.9)
Foreign government
Fair Value
Less Than 12 Months	185.7	57.4
12 Months or More	17.6	17.1
Total	203.3	74.5
Unrealized Losses
Less Than 12 Months	(3.4)	(2.2)
12 Months or More	(0.9)	(1)
Total	(4.3)	(3.2)
Finance | Corporate bonds
Fair Value
Less Than 12 Months	1,567	419.3
12 Months or More	144.7	91.5
Total	1,711.7	510.8
Unrealized Losses
Less Than 12 Months	(32)	(9.7)
12 Months or More	(6.6)	(2.2)
Total	(38.6)	(11.9)
Industrial | Corporate bonds
Fair Value
Less Than 12 Months	1,552.8	437.1
12 Months or More	229.4	255.4
Total	1,782.2	692.5
Unrealized Losses
Less Than 12 Months	(40.1)	(16.4)
12 Months or More	(13.4)	(9.7)
Total	(53.5)	(26.1)
Utilities | Corporate bonds
Fair Value
Less Than 12 Months	204.1	72.5
12 Months or More	23.7	11.9
Total	227.8	84.4
Unrealized Losses
Less Than 12 Months	(5.6)	(2)
12 Months or More	(1)	(0.1)
Total	(6.6)	(2.1)
Commercial mortgage-backed securities
Fair Value
Less Than 12 Months	159.9	81.5
12 Months or More	131	157.5
Total	290.9	239
Unrealized Losses
Less Than 12 Months	(6.1)	(4.1)
12 Months or More	(9.9)	(6.3)
Total	(16)	(10.4)
Agency backed | Residential mortgage-backed securities
Fair Value
Less Than 12 Months	803.9	91.7
12 Months or More	127.8	167.8
Total	931.7	259.5
Unrealized Losses
Less Than 12 Months	(15.3)	(4.7)
12 Months or More	(8.2)	(6.7)
Total	(23.5)	(11.4)
Non-agency backed | Residential mortgage-backed securities
Fair Value
Less Than 12 Months		2.9
12 Months or More		0.8
Total		3.7
Unrealized Losses
Less Than 12 Months		0
12 Months or More		(0.1)
Total		(0.1)
Collateralized loan / debt obligations
Fair Value
Less Than 12 Months	474.9	56.8
12 Months or More	0	4.3
Total	474.9	61.1
Unrealized Losses
Less Than 12 Months	(4.1)	(0.2)
12 Months or More	0	(0.1)
Total	$ (4.1)	(0.3)
Asset backed securities
Fair Value
Less Than 12 Months		7.1
12 Months or More		3.1
Total		10.2
Unrealized Losses
Less Than 12 Months		0
12 Months or More		(0.1)
Total		$ (0.1)

Investments - Trading Securitie

Investments - Trading Securities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	$ 3.7		$ 3.7		$ 52.2
Gross Unrealized Gains	0		0		0.1
Gross Unrealized Losses	(0.5)		(0.5)		(2.5)
Fair Value	3.2		3.2		49.8
Proceeds from sale of trading securities	165.6	$ 70.5	448.5	$ 379.9
Net gains (losses) recognized during the period on trading securities	1.6	1.7	(3.4)	(2.9)
Less: Net losses (gains) recognized during the period on trading securities sold during the period	0.9	1.9	(3)	4.2
Unrealized gains (losses) recognized during the reporting period on trading securities still held at the reporting date	0.7	$ (0.2)	(0.4)	$ (7.1)
Corporate bonds | Industrial
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	3.7		3.7		26.7
Gross Unrealized Gains	0		0		0.1
Gross Unrealized Losses	(0.5)		(0.5)		(2.4)
Fair Value	$ 3.2		$ 3.2		24.4
Corporate bonds | Finance
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost					0.5
Gross Unrealized Gains					0
Gross Unrealized Losses					0
Fair Value					0.5
U.S. treasury securities
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost					25
Gross Unrealized Gains					0
Gross Unrealized Losses					(0.1)
Fair Value					$ 24.9

Investments - Equity Investment

Investments - Equity Investments (Details) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Trading, and Equity Securities, FV-NI [Table] [Line Items]
Original Cost		$ 123.2	$ 195.9
Gross Unrealized Gains		32.8	30.6
Gross Unrealized Losses		(16.7)	(14.8)
Fair Value	[1]	139.3	211.7
Preferred stock
Debt Securities, Trading, and Equity Securities, FV-NI [Table] [Line Items]
Original Cost		0.6	0.5
Gross Unrealized Gains		0	0
Gross Unrealized Losses		0	0
Fair Value		0.6	0.5
Common stock
Debt Securities, Trading, and Equity Securities, FV-NI [Table] [Line Items]
Original Cost		122.6	195.4
Gross Unrealized Gains		32.8	30.6
Gross Unrealized Losses		(16.7)	(14.8)
Fair Value		$ 138.7	$ 211.2
[1]	In connection with the adoption of ASU 2016-01, the consolidated balance sheets as of December 31, 2017 have been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the adoption of ASU 2016-01.

Investments - Unrealized Gain (

Investments - Unrealized Gain (Loss) on Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Net gains (losses) recognized during the period on equity securities	$ 2.6	$ (5.3)	$ 11.3	$ 11.7
Less: Net losses (gains) recognized during the period on equity securities sold during the period	2.2	(2.2)	0.8	(7.2)
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date	$ 0.4	$ (3.1)	$ 10.5	$ 18.9

Investments - Net Investment In

Investments - Net Investment Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 71.2	$ 66.3	$ 213.6	$ 183.9
Investment expenses and interest expense on securities sold under agreement to repurchase	(1.4)	(5.2)	(7.3)	(10.2)
Net investment income	69.8	61.1	206.3	173.7
Fixed maturity securities, available-for-sale
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	62.4	60.5	183.8	187.2
Fixed Maturities, Trading
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	(1.3)	0.5	3.5	1.5
Equity securities
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	0.1	0.3	0.8	1.9
Cash and short term investments
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	3.9	5.7	12.7	9
Other invested assets
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 6.1	$ (0.7)	$ 12.8	$ (15.7)

Investments - Realized Gains an

Investments - Realized Gains and Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Gross Gains
Fixed maturity securities, available-for-sale	$ 23.5	$ 15.6	$ 43.4	$ 38
Fixed maturity securities, trading	1.6	1.7	3	6.9
Equity securities	8.5		32.2
Other invested assets	0	3.5	0.2	19.5
Total	33.6	36.2	78.8	100.8
Gross Losses [Abstract]
Fixed maturity securities, available-for-sale	(7.6)	(1.1)	(23.4)	(3.2)
Fixed maturity securities, trading	0	0	(6.4)	(9.8)
Equity securities	(5.9)		(20.9)
Other invested assets	0	0	0	0
Other-than-temporary impairment of other invested assets	(4.5)	0	(4.5)	0
Other-than-temporary impairment of fixed maturity securities, available-for-sale			(0.3)	0
Total	(18)	(11.7)	(55.5)	(44.2)
Net Gains (Losses) [Abstract]
Fixed maturity securities, available-for-sale	15.9	14.5	20	34.8
Net gains (losses) recognized during the period on trading securities	1.6	1.7	(3.4)	(2.9)
Net gains (losses) recognized during the period on equity securities	2.6	(5.3)	11.3	11.7
Other invested assets	0	3.5	0.2	19.5
Total	$ 15.6	24.5	$ 23.3	56.6
Pro Forma
Gross Gains
Equity securities		15.4		36.4
Gross Losses [Abstract]
Equity securities		(10.6)		(31.2)
Net Gains (Losses) [Abstract]
Net gains (losses) recognized during the period on equity securities		$ 4.8		$ 5.2

Investments - Fair Values of Re

Investments - Fair Values of Restricted Assets (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Restricted cash and cash equivalents	$ 439	$ 480.1
Restricted investments	3,333.4	3,193.8
Total restricted cash, cash equivalents and investments	$ 3,772.4	$ 3,673.9

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Assets and Financial Liabilities on Recurring Basis (Detail) - USD ($) $ in Millions		Sep. 30, 2018	Dec. 31, 2017
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Equity securities, at fair value	[1]	$ 139.3	$ 211.7
Short term investments		198	187.8
Other investments		4.1	5
Life settlement contracts		1.9	20.8
Less: Fixed maturity securities classified as held for sale (see note 13)			(35.3)
Total financial assets		8,843.2	7,963.4
Financial Liabilities Fair Value Disclosure [Abstract]
Securities sold but not yet purchased, at fair value		33.1	75.5
Securities sold under agreements to repurchase		233.8
Life settlement contract profit commission		3	3.2
Contingent consideration		25.7	75.4
Total financial liabilities		295.6	154.1
Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Equity securities, at fair value		137.9	210.7
Short term investments		0	0
Other investments		0	0
Life settlement contracts		0	0
Less: Fixed maturity securities classified as held for sale (see note 13)			0
Total financial assets		334.2	534.9
Financial Liabilities Fair Value Disclosure [Abstract]
Securities sold but not yet purchased, at fair value		33	70.8
Securities sold under agreements to repurchase		0
Life settlement contract profit commission		0	0
Contingent consideration		0	0
Total financial liabilities		33	70.8
Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Equity securities, at fair value		0.7	0.5
Short term investments		198	187.8
Other investments		0	0
Life settlement contracts		0	0
Less: Fixed maturity securities classified as held for sale (see note 13)			(35.3)
Total financial assets		8,480.6	7,378.1
Financial Liabilities Fair Value Disclosure [Abstract]
Securities sold but not yet purchased, at fair value		0.1	4.7
Securities sold under agreements to repurchase		233.8
Life settlement contract profit commission		0	0
Contingent consideration		0	0
Total financial liabilities		233.9	4.7
Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Equity securities, at fair value		0.7	0.5
Short term investments		0	0
Other investments		4.1	5
Life settlement contracts		1.9	20.8
Less: Fixed maturity securities classified as held for sale (see note 13)			0
Total financial assets		28.4	50.4
Financial Liabilities Fair Value Disclosure [Abstract]
Securities sold but not yet purchased, at fair value		0	0
Securities sold under agreements to repurchase		0
Life settlement contract profit commission		3	3.2
Contingent consideration		25.7	75.4
Total financial liabilities		28.7	78.6
U.S. treasury securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		196.3	324.2
U.S. treasury securities | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		196.3	324.2
U.S. treasury securities | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
U.S. treasury securities | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
U.S. government agencies
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		124	50.5
U.S. government agencies | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
U.S. government agencies | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		124	50.5
U.S. government agencies | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Municipal bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		870.9	1,045.5
Municipal bonds | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Municipal bonds | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		870	1,045.1
Municipal bonds | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0.9	0.4
Foreign government
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		250.2	151.7
Foreign government | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Foreign government | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		250.2	151.7
Foreign government | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Finance | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		2,056.8	1,769.9
Finance | Level 1 | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Finance | Level 2 | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		2,056.8	1,769.9
Finance | Level 3 | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Industrial | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		2,343.5	2,292.6
Industrial | Level 1 | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Industrial | Level 2 | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		2,343.5	2,292.6
Industrial | Level 3 | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Utilities | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		313.9	332.4
Utilities | Level 1 | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Utilities | Level 2 | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		313.9	332.4
Utilities | Level 3 | Corporate bonds
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Commercial mortgage-backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		371.5	412.7
Commercial mortgage-backed securities | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Commercial mortgage-backed securities | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		351.5	389.8
Commercial mortgage-backed securities | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		20	22.9
Agency backed
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		1,002.6	556.4
Agency backed | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Agency backed | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		1,002.6	556.4
Agency backed | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Non-agency backed
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0.7	6.8
Non-agency backed | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Non-agency backed | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0.7	6.8
Non-agency backed | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Collateralized loan / debt obligations
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		950.5	600.6
Collateralized loan / debt obligations | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Collateralized loan / debt obligations | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		950.5	600.6
Collateralized loan / debt obligations | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Asset backed securities
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		19	30.1
Asset backed securities | Level 1
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		0	0
Asset backed securities | Level 2
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		18.2	29.3
Asset backed securities | Level 3
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Debt securities		$ 0.8	$ 0.8
[1]	In connection with the adoption of ASU 2016-01, the consolidated balance sheets as of December 31, 2017 have been recast for comparability. See Note 2. "Recent Accounting Pronouncements" for additional information on the adoption of ASU 2016-01.

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Changes in Fair Value of Level 3 Financial Assets And Liabilities (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value, Net Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning Balance	$ (4.1)	$ 358.4	$ (28.2)	$ 351.6
Net income (loss)	6.1	37.3	9	81
Other comprehensive income (loss)	(0.9)	(0.3)	(0.1)	(0.5)
Purchases and issuances	(0.5)	0.1	(0.5)	1.6
Sales and settlements	(0.9)	(142.6)	19.5	(184.6)
Net transfers into Level 3	0	(8.8)	0	(5)
Ending Balance	(0.3)	244.1	(0.3)	244.1
Life settlement contract profit commission
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	(3.2)	(5.7)	(3.2)	(4.9)
Net income (loss)	0.2	(0.2)	0.2	(1)
Other comprehensive income (loss)	0	0	0	0
Purchases and issuances	0	0	0	0
Sales and settlements	0	0	0	0
Net transfers into Level 3	0	0	0	0
Ending balance	(3)	(5.9)	(3)	(5.9)
Contingent consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	(31.2)	(97.7)	(75.4)	(71.7)
Net income (loss)	6	3.3	7.1	(0.4)
Other comprehensive income (loss)	0	0	0	0
Purchases and issuances	(0.5)	(1.9)	(0.5)	(29)
Sales and settlements	0	11.8	43.1	16.6
Net transfers into Level 3	0	0	0	0
Ending balance	(25.7)	(84.5)	(25.7)	(84.5)
Fixed maturities, available-for-sale
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	23.5	41.5	24.1	46.9
Net income (loss)	0	0	(0.3)	0
Other comprehensive income (loss)	(0.9)	0.2	(0.1)	(0.3)
Purchases and issuances	0	2	0	9.5
Sales and settlements	(0.9)	(1.2)	(2)	(4)
Net transfers into Level 3	0	(8.4)	0	(18)
Ending balance	21.7	34.1	21.7	34.1
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	0.8	23.5	0.5	24.4
Net income (loss)	(0.1)	0.6	0.2	0.2
Other comprehensive income (loss)	0	(0.5)	0	(0.2)
Purchases and issuances	0	0	0	4.6
Sales and settlements	0	(21.5)	0	(40.3)
Net transfers into Level 3	0	(0.4)	0	13
Ending balance	0.7	1.7	0.7	1.7
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	4.1		5
Net income (loss)	0		(0.5)
Other comprehensive income (loss)	0		0
Purchases and issuances	0		0
Sales and settlements	0		(0.4)
Net transfers into Level 3	0		0
Ending balance	4.1		4.1
Life settlement contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	1.9	396.8	20.8	356.9
Net income (loss)	0	33.6	2.3	82.2
Other comprehensive income (loss)	0	0	0	0
Purchases and issuances	0	0	0	16.5
Sales and settlements	0	(131.7)	(21.2)	(156.9)
Net transfers into Level 3	0	0	0	0
Ending balance	$ 1.9	$ 298.7	$ 1.9	$ 298.7

Fair Value of Financial Instr_5

Fair Value of Financial Instruments - Fair Value of Debt (Details) $ in Millions	Sep. 30, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate	6.125%
5.5% Convertible senior notes due 2021 (the 2021 Notes)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate	5.50%
2.75% Convertible senior notes due 2044 (the 2044 Notes)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate	2.75%
7.25% Subordinated Notes due 2055
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate	7.25%
7.50% Subordinated Notes due 2055
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate	7.50%
Carrying Value
Fair Value
Revolving credit facility	$ 130
6.125% Notes due 2023	248.7
Secured loan agreements	158.5
Promissory notes and other	112.8
Total debt	1,325
Carrying Value | 5.5% Convertible senior notes due 2021 (the 2021 Notes)
Fair Value
Convertible senior notes due 2044	5.5
Carrying Value | 2.75% Convertible senior notes due 2044 (the 2044 Notes)
Fair Value
Convertible senior notes due 2044	178.2
Carrying Value | Junior subordinated debentures (the 2035-2037 Notes)
Fair Value
Junior subordinated debentures	122.2
Carrying Value | Trust preferred securities (the 2033-2037 TPS Notes)
Fair Value
Junior subordinated debentures	92.8
Carrying Value | 7.25% Subordinated Notes due 2055
Fair Value
Subordinated Notes due 2055	145.4
Carrying Value | 7.50% Subordinated Notes due 2055
Fair Value
Subordinated Notes due 2055	130.9
Fair Value
Fair Value
Revolving credit facility	130
6.125% Notes due 2023	243.9
Secured loan agreements	158.5
Promissory notes and other	112.8
Total debt	1,337.1
Fair Value | 5.5% Convertible senior notes due 2021 (the 2021 Notes)
Fair Value
Convertible senior notes due 2044	5.5
Fair Value | 2.75% Convertible senior notes due 2044 (the 2044 Notes)
Fair Value
Convertible senior notes due 2044	219.5
Fair Value | Junior subordinated debentures (the 2035-2037 Notes)
Fair Value
Junior subordinated debentures	108.5
Fair Value | Trust preferred securities (the 2033-2037 TPS Notes)
Fair Value
Junior subordinated debentures	86.5
Fair Value | 7.25% Subordinated Notes due 2055
Fair Value
Subordinated Notes due 2055	140.9
Fair Value | 7.50% Subordinated Notes due 2055
Fair Value
Subordinated Notes due 2055	$ 131

Fair Value of Financial Instr_6

Fair Value of Financial Instruments - Additional Information (Details) $ in Millions	1 Months Ended
	Jun. 30, 2017shares	Sep. 30, 2018USD ($)	Dec. 31, 2017USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		$ 8,843.2	$ 7,963.4
Financial liabilities		$ 295.6	154.1
Debt instrument, stated interest rate		6.125%
7.25% Subordinated Notes due 2055
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate		7.25%
7.25% Subordinated Notes due 2055 | Subordinated Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate		7.25%
7.50% Subordinated Notes due 2055
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate		7.50%
2.75% Convertible senior notes due 2044 (the 2044 Notes)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate		2.75%
2.75% Convertible senior notes due 2044 (the 2044 Notes) | Convertible Notes Payable
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate		2.75%
6.125% Notes due 2023 | Promissory Note
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument, stated interest rate		6.125%
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of investment in NGHC		$ 45.9	33.6
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		8,480.6	7,378.1
Financial liabilities		233.9	4.7
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure		28.4	50.4
Financial liabilities		$ 28.7	78.6
NGHC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Sale of stock (in shares) | shares	10,586,000
Disposal Group, Held-for-sale, Not Discontinued Operations | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value disclosure			900.9
Financial liabilities			$ 761.7
Measurement Input, Discount Rate | Level 3 | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates, contingent consideration		0.11
Measurement Input, Discount Rate | Level 3 | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates, contingent consideration		0.30

Loss and loss adjustment expe_3

Loss and loss adjustment expense reserves - Reconciliation of the beginning and ending balances for unpaid losses and LAE (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Loss and LAE, gross of related reinsurance recoverables at beginning of year	$ 12,138.8	$ 10,140.7
Less: Reinsurance recoverables at beginning of year	5,669.6	3,873.8
Net balance, beginning of year			$ 6,469.2	$ 6,266.9
Incurred related to:
Current year	2,927.1	2,712
Prior year	42.7	418.9
Total incurred during the year	2,969.8	3,130.9
Paid related to:
Current year	(778)	(699.3)
Prior year	(1,731.9)	(1,593.6)
Total paid during the year	(2,509.9)	(2,292.9)
Acquired outstanding loss and loss adjustment reserves	8.3	200.8
Retroactive reinsurance adjustment	18.7	(1,025)
Effect of foreign exchange rates	(76.8)	138.3
Net balance, end of year	6,879.3	6,419
Plus reinsurance recoverables at end of year	5,671.9	5,667.6
Loss and LAE reserves, at end of period	12,551.2	12,086.6
Loss and LAE, gross of related reinsurance recoverables at end of period	$ 412.4	$ 1,945.9

Loss and loss adjustment expe_4

Loss and loss adjustment expense reserves (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year	$ 42.7	$ 418.9
Adverse development cover, gain	18.7
Prior period adjustment gross	61.4
Small Commercial Business and Specialty Program | Commercial auto and liability, physical damage
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year favorable adjustment	34.3
Specialty Risk and Extended Warranty | Short-tail line of business
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year favorable adjustment	20.5
Accident Year 2014 to 2017 | Small Commercial Business and Specialty Program | Commercial auto and liability, physical damage
Liability for Claims and Claims Adjustment Expense [Line Items]
Adverse adjustment	70.3
Accident Year 2014 to 2017 | Small Commercial Business and Specialty Program | Workers' compensation
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior year favorable adjustment	61
Accident Year 2014 to 2017 | Small Commercial Business | General liability
Liability for Claims and Claims Adjustment Expense [Line Items]
Adverse adjustment	48.3
Accident Year 2014 to 2017 | Specialty Program | General liability
Liability for Claims and Claims Adjustment Expense [Line Items]
Adverse adjustment	$ 38.3

Debt - Borrowings (Detail)

Debt - Borrowings (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.125%
Revolving credit facility	$ 130	$ 130
Secured loan agreements	158.5	174.4
Promissory notes	112.8	66.5
Total debt	$ 1,325	1,288.7
5.5% Convertible senior notes due 2021 (the 2021 Notes)
Debt Instrument [Line Items]
Debt instrument, stated interest rate	5.50%
Convertible senior notes	$ 5.5	5.4
2.75% Convertible senior notes due 2044 (the 2044 Notes)
Debt Instrument [Line Items]
Debt instrument, stated interest rate	2.75%
Convertible senior notes	$ 178.2	173
6.125% Notes due 2023 (the 2023 Notes)
Debt Instrument [Line Items]
Debt instrument, stated interest rate	6.125%
6.125% Notes due 2023 (the 2023 Notes)	$ 248.7	248.4
Junior subordinated debentures (the 2035-2037 Notes)
Debt Instrument [Line Items]
Junior subordinated debentures (the 2035-2037 Notes)	122.2	122.1
Trust preferred securities (the 2033-2037 TPS Notes)
Debt Instrument [Line Items]
Junior subordinated debentures (the 2035-2037 Notes)	$ 92.8	92.8
7.25% Subordinated Notes due 2055
Debt Instrument [Line Items]
Debt instrument, stated interest rate	7.25%
Subordinate Notes due 2055	$ 145.4	145.3
7.50% Subordinated Notes due 2055
Debt Instrument [Line Items]
Debt instrument, stated interest rate	7.50%
Subordinate Notes due 2055	$ 130.9	$ 130.8

Debt - Credit Facilities (Detai

Debt - Credit Facilities (Details) - 9 months ended Sep. 30, 2018 - Line of Credit	USD ($)	GBP (£)
Revolving credit facility
Line of Credit Facility [Line Items]
Limit	$ 175,000,000
Outstanding	173,900,000
Available	1,100,000
Lloyds | Letter of Credit
Line of Credit Facility [Line Items]
Limit	592,900,000	£ 455,000,000
Outstanding	564,300,000
Available	$ 28,600,000
Debt covenant, forecast underwriting losses threshold	25.00%
ING Bank N.V. and Deutsche Bank Netherlands N.V. | Letter of Credit
Line of Credit Facility [Line Items]
Limit	$ 100,600,000
Outstanding	97,100,000
Available	3,500,000
Comerica Bank | Letter of Credit
Line of Credit Facility [Line Items]
Limit	75,000,000
Outstanding	48,800,000
Available	26,200,000
Other Letters of Credit | Letter of Credit
Line of Credit Facility [Line Items]
Limit	114,000,000
Outstanding	114,000,000
Available	$ 0

Debt - Interest Expense (Detail

Debt - Interest Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Interest expense	$ 22.9	$ 22.9	$ 67.6	$ 70.7
Convertible Notes Payable | 2021 Notes
Debt Instrument [Line Items]
Interest expense	0.2	0.2	0.4	0.4
Convertible Notes Payable | 2044 Notes
Debt Instrument [Line Items]
Interest expense	3.4	3.3	10.1	9.7
Senior Notes | 2023 Notes
Debt Instrument [Line Items]
Interest expense	3.9	3.9	11.7	11.7
Convertible Debt | 2035-2037 Notes
Debt Instrument [Line Items]
Interest expense	1.8	1.4	5.1	4.3
Junior Subordinated Debt | 2033-2037 TPS Notes
Debt Instrument [Line Items]
Interest expense	1.4	1.1	3.9	3.2
Subordinated Debt | 7.25% 2055 Notes
Debt Instrument [Line Items]
Interest expense	2.8	2.8	8.3	8.3
Subordinated Debt | 7.50% 2055 Notes
Debt Instrument [Line Items]
Interest expense	2.6	2.6	7.7	7.7
Secured loan agreements
Debt Instrument [Line Items]
Interest expense	1.6	1.7	4.9	4.5
Promissory notes
Debt Instrument [Line Items]
Interest expense	1.1	0.9	2.8	3.6
Other
Debt Instrument [Line Items]
Interest expense	0.9	2	3.3	8.6
Revolving credit facility | Line of Credit
Debt Instrument [Line Items]
Interest expense	1.9	1.6	5.3	4.6
Lloyds | Funds at Lloyd's facility | Line of Credit
Debt Instrument [Line Items]
Interest expense	$ 1.3	$ 1.4	$ 4.1	$ 4.1

Earnings Per Share - Summary of

Earnings Per Share - Summary of Elements Used in Calculating Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net (loss) income attributable to AmTrust common stockholders	$ (84.5)	$ (174.7)	$ 461.1	$ (146.2)
Denominator:
Weighted average common shares outstanding - basic (in shares)	197.6	195.9	196.9	182.6
Plus: Dilutive effect of stock options, convertible debt, other (in shares)	0	0	0.4	0
Weighted average common shares outstanding - dilutive (in shares)	197.6	195.9	197.3	182.6
Net income per AmTrust common share - basic (usd per share)	$ (0.43)	$ (0.89)	$ 2.34	$ (0.80)
Net income per AmTrust common shares – diluted (usd per share)	$ (0.43)	$ (0.89)	$ 2.34	$ (0.80)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Provision (benefit) from income taxes	$ (21.5)	$ (62.6)	$ (40.5)	$ (61)
Effective tax rate	35.50%	28.30%	(8.10%)	28.50%
Operating loss carryforwards, limitation on use per year	$ 9.1		$ 9.1
Operating loss carryforwards, valuation allowance	206.1		206.1		$ 195.1
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	62.2		62.2
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 1,081.1		$ 1,081.1

Related Party Transactions (Nar

Related Party Transactions (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018
Maiden Reinsurance | Quota Share Reinsurance Agreement
Related Party Transaction [Line Items]
Reinsurance agreement, term (years)			3 years
Reinsurance agreement, decrease in shareholders equity (percentage)			50.00%
Evergreen Parent
Related Party Transaction [Line Items]
Transaction expenses	$ (33.5)	$ 36.6

Stockholders' Equity - Narrativ

Stockholders' Equity - Narrative (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017
Class of Stock [Line Items]
Net income (loss)	$ (70.7)	$ (103.5)	$ 675.9	$ (159.1)	$ 28.8	$ 49.9
Net income (loss) attributable to non-controlling interest and redeemable non-controlling interest of subsidiaries	(2.8)			(0.7)			$ (2.5)	$ 17
Non-Controlling Interest
Class of Stock [Line Items]
Net income (loss)	$ (2.8)	$ (3.8)	$ (2.5)	$ (1)	$ 6.4	$ 10.7	$ (9.1)	$ 16.1

Stockholders' Equity - Ownershi

Stockholders' Equity - Ownership Components of Total Equity (Detail) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 3,601.1	$ 3,932.3	$ 3,368.1	$ 3,896.7	$ 3,512.3	$ 3,465.6	$ 3,368.1	$ 3,465.6
Net income (loss)	(70.7)	(103.5)	675.9	(159.1)	28.8	49.9
Unrealized holding gain, net of tax	(16.9)	(12.2)	(124.7)	19.8	49.5	25.6
Reclassification adjustment	(15.9)	(2.5)	(1.6)	(23.3)	(19.3)	(11.6)	(20)	(54.2)
Foreign currency translation	(29)	(86.1)	61.7	50.6	62.7	13.9	(53.4)	127.2
Distribution of non-controlling interest		(114.6)
Unrealized gain on interest rate swap	0			0.1		0.1	0	0.2
Share exercises, compensation and other	7.2	4.2	2.9	9.4	4	5.9
Common stock issuance					298.6
Common stock dividends			(33.4)	(32.5)	(34.1)	(29.1)
Preferred stock dividends	(16.6)	(16.5)	(16.6)	(16.6)	(16.5)	(16.6)	(49.7)	(49.7)
Capital distributions, net				(50.6)	10.7	8.6
Ending Balance	3,459.2	3,601.1	3,932.3	3,694.5	3,896.7	3,512.3	3,459.2	3,694.5
Total AmTrust Financial Services, Inc. equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	3,543.6	3,756.9	3,189.7	3,663.8	3,296.5	3,269.1	3,189.7	3,269.1
Net income (loss)	(67.9)	(99.7)	678.4	(158.1)	22.4	39.2
Unrealized holding gain, net of tax	(16.9)	(12.2)	(124.7)	19.8	49.5	25.6
Reclassification adjustment	(15.9)	(2.5)	(1.6)	(23.3)	(19.3)	(11.6)
Foreign currency translation	(29)	(86.6)	62.2	50.6	62.7	13.9
Unrealized gain on interest rate swap				0.1		0.1
Share exercises, compensation and other	7.2	4.2	2.9	9.4	4	5.9
Common stock issuance					298.6
Common stock dividends			(33.4)	(32.5)	(34.1)	(29.1)
Preferred stock dividends	(16.6)	(16.5)	(16.6)	(16.6)	(16.5)	(16.6)
Ending Balance	3,404.5	3,543.6	3,756.9	3,513.2	3,663.8	3,296.5	3,404.5	3,513.2
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	2.1	2.1	2.1	2.1	2	2	2.1	2
Common stock issuance					0.1
Ending Balance	2.1	2.1	2.1	2.1	2.1	2	2.1	2.1
Preferred stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	913.7	913.7	913.7	913.7	913.7	913.7	913.7	913.7
Common stock issuance					0
Ending Balance	913.7	913.7	913.7	913.7	913.7	913.7	913.7	913.7
Additional paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,622.8	1,640.9	1,639.6	1,626	1,386.4	1,385	1,639.6	1,385
Share exercises, compensation and other	4.9	(18.1)	1.3	8.1	1	1.4
Common stock issuance					238.6
Ending Balance	1,627.7	1,622.8	1,640.9	1,634.1	1,626	1,386.4	1,627.7	1,634.1
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(218.2)	(240.5)	(242.1)	(243.5)	(306.4)	(310.9)	(242.1)	(310.9)
Share exercises, compensation and other	2.3	22.3	1.6	1.3	3	4.5
Common stock issuance					59.9
Ending Balance	(215.9)	(218.2)	(240.5)	(242.2)	(243.5)	(306.4)	(215.9)	(242.2)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	(150.6)	(49.3)	15.5	(4.9)	(97.8)	(125.8)	15.5	(125.8)
Net cumulative effect adjustments									$ (0.7)
Unrealized holding gain, net of tax	(16.9)	(12.2)	(124.7)	19.8	49.5	25.6
Reclassification adjustment	(15.9)	(2.5)	(1.6)	(23.3)	(19.3)	(11.6)
Foreign currency translation	(29)	(86.6)	62.2	50.6	62.7	13.9
Unrealized gain on interest rate swap				0.1		0.1
Share exercises, compensation and other			0
Ending Balance	(212.4)	(150.6)	(49.3)	42.3	(4.9)	(97.8)	(212.4)	42.3
Retained earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	1,373.8	1,490	860.9	1,370.4	1,398.6	1,405.1	860.9	1,405.1
Net cumulative effect adjustments									$ 0.7
Net income (loss)	(67.9)	(99.7)	678.4	(158.1)	22.4	39.2
Common stock dividends			(33.4)	(32.5)	(34.1)	(29.1)
Preferred stock dividends	(16.6)	(16.5)	(16.6)	(16.6)	(16.5)	(16.6)
Ending Balance	1,289.3	1,373.8	1,490	1,163.2	1,370.4	1,398.6	1,289.3	1,163.2
Non-Controlling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	57.5	175.4	178.4	232.9	215.8	196.5	178.4	196.5
Net income (loss)	(2.8)	(3.8)	(2.5)	(1)	6.4	10.7	(9.1)	16.1
Foreign currency translation		0.5	(0.5)
Distribution of non-controlling interest		(114.6)
Capital distributions, net				(50.6)	10.7	8.6
Ending Balance	$ 54.7	$ 57.5	$ 175.4	$ 181.3	$ 232.9	$ 215.8	$ 54.7	$ 181.3

Stockholders' Equity - AOCI (De

Stockholders' Equity - AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	$ 3,601.1	$ 3,896.7	$ 3,368.1	$ 3,465.6
Other comprehensive (loss) income, net of tax	(61.8)	47.2	(227.9)	168.1
Ending Balance	3,459.2	3,694.5	3,459.2	3,694.5
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(150.6)	(4.9)	15.5	(125.8)
Net cumulative effect adjustments			(0.7)
Other comprehensive income (loss) before reclassifications	(53.9)	67.8	(253.2)	242.5
Amounts reclassed from accumulated other comprehensive loss	(15.9)	(23.3)	(20)	(54.1)
Income tax benefit (expense)	8	2.7	46	(20.3)
Other comprehensive (loss) income, net of tax	(61.8)	47.2	(227.9)	168.1
Ending Balance	(212.4)	42.3	(212.4)	42.3
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(69.2)	(111.6)	(44.8)	(188.2)
Net cumulative effect adjustments			0
Other comprehensive income (loss) before reclassifications	(29)	50.6	(53.4)	127.2
Amounts reclassed from accumulated other comprehensive loss	0	0	0	0
Income tax benefit (expense)	0	0	0	0
Other comprehensive (loss) income, net of tax	(29)	50.6	(53.4)	127.2
Ending Balance	(98.2)	(61)	(98.2)	(61)
Unrealized Gains (Losses) on Investments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(79.1)	110	62.6	65.8
Net cumulative effect adjustments			(0.7)
Other comprehensive income (loss) before reclassifications	(24.9)	17.1	(199.8)	115.1
Amounts reclassed from accumulated other comprehensive loss	(15.9)	(23.3)	(20)	(54.1)
Income tax benefit (expense)	8	2.7	46	(20.3)
Other comprehensive (loss) income, net of tax	(32.8)	(3.5)	(174.5)	40.7
Ending Balance	(111.9)	106.5	(111.9)	106.5
Interest Rate Swap Hedge
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	0	(0.1)	0	(0.2)
Net cumulative effect adjustments			0
Other comprehensive income (loss) before reclassifications	0	0.1	0	0.2
Amounts reclassed from accumulated other comprehensive loss	0	0	0	0
Income tax benefit (expense)	0	0	0	0
Other comprehensive (loss) income, net of tax	0	0.1	0	0.2
Ending Balance	0	0	0	0
Net Benefit Plan Assets and Obligations Recognized in Stockholders' Equity
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning Balance	(2.3)	(3.2)	(2.3)	(3.2)
Net cumulative effect adjustments			0
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassed from accumulated other comprehensive loss	0	0	0	0
Income tax benefit (expense)	0	0	0	0
Other comprehensive (loss) income, net of tax	0	0	0	0
Ending Balance	$ (2.3)	$ (3.2)	$ (2.3)	$ (3.2)

Commitments and Contingencies (

Commitments and Contingencies (Narrative) (Details)	Jun. 28, 2017shareholder	May 11, 2017shareholder	Apr. 27, 2017shareholdersuit	Apr. 07, 2015shareholder	Apr. 30, 2017suit	Apr. 30, 2017case
Commitments and Contingencies Disclosure [Abstract]
Number of stockholders	2	1	1	1
Number of claims filed			2		3	3

Segments - Results of Operation

Segments - Results of Operations of Business Segments (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)segment	Sep. 30, 2017USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment			3
Revenues:
Net earned premium	$ 1,425.2	$ 1,192.9	$ 4,066.3	$ 3,796.1
Losses and expenses:
Loss and loss adjustment expense	1,063.2	1,266.1	2,969.8	3,130.9
Amortization of deferred acquisition costs	297.7	169.2	819.6	587.7
Underwriting, general and administrative expenses	171	167.9	508.8	450.8
Total losses and expenses	1,531.9	1,603.2	4,298.2	4,169.4
Underwriting (loss) gain	(106.7)	(410.3)	(231.9)	(373.3)
Other income (losses and expenses):
Service and fee income	52.5	180.5	217.9	486.4
Investment income and realized gain on investments	85.4	85.6	229.6	230.3
Other expenses	(82.4)	(177.4)	(406.3)	(540.1)
Interest expense	(22.9)	(22.9)	(67.6)	(70.7)
Foreign currency gain (loss)	14	(62.8)	28.9	(139.7)
Other (expenses) revenues	(0.4)	185.9	728.9	193.1
Benefit (provision) for income taxes	21.5	62.6	40.5	61
Equity in (loss) earnings of unconsolidated subsidiaries	(31.7)	0	(31.7)	73.5
Net (loss) income	(70.7)	(158.8)	508.3	(79.5)
Workers' compensation
Revenues:
Net earned premium	409.8	424	1,275.5	1,357
Warranty
Revenues:
Net earned premium	266	243.1	797.8	684
Commercial auto and liability, physical damage
Revenues:
Net earned premium	151	111.2	444.2	362.4
Commercial multiple-peril
Revenues:
Net earned premium	109.5	95.8	320.9	211.7
Other liabilities
Revenues:
Net earned premium	104.6	86.1	260	300.1
Medical malpractice
Revenues:
Net earned premium	56	60.9	160.4	167.6
Accident and health
Revenues:
Net earned premium	45.5	27.5	128.9	106.6
Surety
Revenues:
Net earned premium	38.3	45	110.3	123.5
Homeowners multiple-peril
Revenues:
Net earned premium	32.4	10.3	104.5	68
Fire
Revenues:
Net earned premium	43.5	32.9	100.2	180.2
Inland Marine
Revenues:
Net earned premium	25.1	8.5	66.9	30.4
Crop
Revenues:
Net earned premium	74.2	28.2	79.7	29.9
Other
Revenues:
Net earned premium	69.3	19.4	217	174.7
Operating Segments
Other income (losses and expenses):
Net (loss) income
Corporate and Other
Revenues:
Net earned premium	0	0	0	0
Losses and expenses:
Loss and loss adjustment expense	0	0	0	0
Amortization of deferred acquisition costs	0	0	0	0
Underwriting, general and administrative expenses	0	0	0	0
Total losses and expenses	0	0	0	0
Underwriting (loss) gain	0	0	0	0
Other income (losses and expenses):
Service and fee income	17.1	37.9	52.8	97.1
Investment income and realized gain on investments	0	0	0	0
Other expenses	(40.6)	(88.7)	(203.1)	(270)
Interest expense	0	0	0	0
Foreign currency gain (loss)	0	0	0	0
Other (expenses) revenues	3.3	186.6	727.5	186.6
Benefit (provision) for income taxes	13.6	(38.9)	33.8	(37.9)
Equity in (loss) earnings of unconsolidated subsidiaries	(31.7)		(31.7)	73.5
Net (loss) income	(38.3)	96.9	579.3	49.3
Small Commercial Business
Revenues:
Net earned premium	646.5	529.1	1,913.4	1,714.6
Small Commercial Business | Workers' compensation
Revenues:
Net earned premium	369.4	339.6	1,124.3	1,049
Small Commercial Business | Warranty
Revenues:
Net earned premium	0	0.9	0	0.9
Small Commercial Business | Commercial auto and liability, physical damage
Revenues:
Net earned premium	124.9	76.8	363.5	273.5
Small Commercial Business | Commercial multiple-peril
Revenues:
Net earned premium	90.2	84	254.9	182.2
Small Commercial Business | Other liabilities
Revenues:
Net earned premium	0	0	0	0
Small Commercial Business | Medical malpractice
Revenues:
Net earned premium	0	0	0	0
Small Commercial Business | Accident and health
Revenues:
Net earned premium	0	0	0	0
Small Commercial Business | Surety
Revenues:
Net earned premium	16.1	13.7	45.6	39.8
Small Commercial Business | Homeowners multiple-peril
Revenues:
Net earned premium	11.4	7.5	24.5	33.1
Small Commercial Business | Fire
Revenues:
Net earned premium	1.8	2.7	5.2	22.8
Small Commercial Business | Inland Marine
Revenues:
Net earned premium	2	1.2	5.3	4.2
Small Commercial Business | Crop
Revenues:
Net earned premium	0	0	0	0
Small Commercial Business | Other
Revenues:
Net earned premium	30.7	2.7	90.1	109.1
Small Commercial Business | Operating Segments
Revenues:
Net earned premium	646.5	529.1	1,913.4	1,714.6
Losses and expenses:
Loss and loss adjustment expense	473.3	546.2	1,450	1,390.5
Amortization of deferred acquisition costs	145.8	109.8	392.1	339.1
Underwriting, general and administrative expenses	77.2	74.7	239.4	203.6
Total losses and expenses	696.3	730.7	2,081.5	1,933.2
Underwriting (loss) gain	(49.8)	(201.6)	(168.1)	(218.6)
Other income (losses and expenses):
Service and fee income	3.5	27.6	29.4	87.2
Investment income and realized gain on investments	38	33	101.5	95.2
Other expenses	(18.5)	(45.2)	(104.1)	(141.9)
Interest expense	(10.8)	(11.7)	(34.6)	(37.2)
Foreign currency gain (loss)	0	0	0	0
Other (expenses) revenues	(2)	(0.5)	0.7	3.4
Benefit (provision) for income taxes	17.2	65	15.1	64.6
Equity in (loss) earnings of unconsolidated subsidiaries	0		0	0
Net (loss) income	(22.4)	(133.4)	(160.1)	(147.3)
Specialty Risk and Extended Warranty
Revenues:
Net earned premium	685.2	482.8	1,840.4	1,495.3
Specialty Risk and Extended Warranty | Workers' compensation
Revenues:
Net earned premium	0	0	0	0
Specialty Risk and Extended Warranty | Warranty
Revenues:
Net earned premium	266	242.2	797.8	683.1
Specialty Risk and Extended Warranty | Commercial auto and liability, physical damage
Revenues:
Net earned premium	0	0	0	0
Specialty Risk and Extended Warranty | Commercial multiple-peril
Revenues:
Net earned premium	11.9	0	37.8	1.7
Specialty Risk and Extended Warranty | Other liabilities
Revenues:
Net earned premium	89.6	37.5	225.6	144.8
Specialty Risk and Extended Warranty | Medical malpractice
Revenues:
Net earned premium	56	60.9	160.4	167.6
Specialty Risk and Extended Warranty | Accident and health
Revenues:
Net earned premium	45.5	27.5	128.9	106.6
Specialty Risk and Extended Warranty | Surety
Revenues:
Net earned premium	22.2	31.3	64.7	83.6
Specialty Risk and Extended Warranty | Homeowners multiple-peril
Revenues:
Net earned premium	20.1	2.6	76.6	32
Specialty Risk and Extended Warranty | Fire
Revenues:
Net earned premium	41.7	30.2	95	156.6
Specialty Risk and Extended Warranty | Inland Marine
Revenues:
Net earned premium	23.1	7.1	61.6	24.9
Specialty Risk and Extended Warranty | Crop
Revenues:
Net earned premium	74.2	28.2	79.7	29.9
Specialty Risk and Extended Warranty | Other
Revenues:
Net earned premium	34.9	15.3	112.3	64.5
Specialty Risk and Extended Warranty | Operating Segments
Revenues:
Net earned premium	685.2	482.8	1,840.4	1,495.3
Losses and expenses:
Loss and loss adjustment expense	474.2	458.3	1,223.4	1,141.8
Amortization of deferred acquisition costs	129.9	18.4	350.4	83.3
Underwriting, general and administrative expenses	82.7	67.6	230.3	177.6
Total losses and expenses	686.8	544.3	1,804.1	1,402.7
Underwriting (loss) gain	(1.6)	(61.5)	36.3	92.6
Other income (losses and expenses):
Service and fee income	31.4	114.5	133.9	299.6
Investment income and realized gain on investments	33.2	33.5	90.7	87.4
Other expenses	(19.4)	(33.5)	(81.4)	(95.6)
Interest expense	(10)	(8.7)	(27.1)	(25)
Foreign currency gain (loss)	14	(62.8)	28.9	(139.7)
Other (expenses) revenues	(1.4)	(0.1)	0.6	2.3
Benefit (provision) for income taxes	(19.8)	(39.2)	(15.7)	(42.3)
Equity in (loss) earnings of unconsolidated subsidiaries	0		0	0
Net (loss) income	26.4	(57.8)	166.2	179.3
Specialty Program
Revenues:
Net earned premium	93.5	181	312.5	586.2
Specialty Program | Workers' compensation
Revenues:
Net earned premium	40.4	84.4	151.2	308
Specialty Program | Warranty
Revenues:
Net earned premium	0	0	0	0
Specialty Program | Commercial auto and liability, physical damage
Revenues:
Net earned premium	26.1	34.4	80.7	88.9
Specialty Program | Commercial multiple-peril
Revenues:
Net earned premium	7.4	11.8	28.2	27.8
Specialty Program | Other liabilities
Revenues:
Net earned premium	15	48.6	34.4	155.3
Specialty Program | Medical malpractice
Revenues:
Net earned premium	0	0	0	0
Specialty Program | Accident and health
Revenues:
Net earned premium	0	0	0	0
Specialty Program | Surety
Revenues:
Net earned premium	0	0	0	0.1
Specialty Program | Homeowners multiple-peril
Revenues:
Net earned premium	0.9	0.2	3.4	2.9
Specialty Program | Fire
Revenues:
Net earned premium	0	0	0	0.8
Specialty Program | Inland Marine
Revenues:
Net earned premium	0	0.2	0	1.3
Specialty Program | Crop
Revenues:
Net earned premium	0	0	0	0
Specialty Program | Other
Revenues:
Net earned premium	3.7	1.4	14.6	1.1
Specialty Program | Operating Segments
Revenues:
Net earned premium	93.5	181	312.5	586.2
Losses and expenses:
Loss and loss adjustment expense	115.7	261.6	296.4	598.6
Amortization of deferred acquisition costs	22	41	77.1	165.3
Underwriting, general and administrative expenses	11.1	25.6	39.1	69.6
Total losses and expenses	148.8	328.2	412.6	833.5
Underwriting (loss) gain	(55.3)	(147.2)	(100.1)	(247.3)
Other income (losses and expenses):
Service and fee income	0.5	0.5	1.8	2.5
Investment income and realized gain on investments	14.2	19.1	37.4	47.7
Other expenses	(3.9)	(10)	(17.7)	(32.6)
Interest expense	(2.1)	(2.5)	(5.9)	(8.5)
Foreign currency gain (loss)	0	0	0	0
Other (expenses) revenues	(0.3)	(0.1)	0.1	0.8
Benefit (provision) for income taxes	10.5	75.7	7.3	76.6
Equity in (loss) earnings of unconsolidated subsidiaries	0		0	0
Net (loss) income	$ (36.4)	$ (64.5)	$ (77.1)	$ (160.8)

Segments (Disaggregation of rev

Segments (Disaggregation of revenue) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 39.9	$ 196.8
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	9.2	34.4
Small Commercial Business | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1.9	23.7
Specialty Risk and Extended Warranty | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	28.3	136.9
Specialty Program | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	0.5	1.8
Product warranty registration and service
Disaggregation of Revenue [Line Items]
Revenue	15.8	90.7
Product warranty registration and service | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	0	0
Product warranty registration and service | Small Commercial Business | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	0	0
Product warranty registration and service | Specialty Risk and Extended Warranty | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	15.8	90.7
Product warranty registration and service | Specialty Program | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	0	0
Broker and agency services, and insurance-related services
Disaggregation of Revenue [Line Items]
Revenue	14.9	71.7
Broker and agency services, and insurance-related services | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	0	0
Broker and agency services, and insurance-related services | Small Commercial Business | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1.9	23.7
Broker and agency services, and insurance-related services | Specialty Risk and Extended Warranty | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	12.5	46.2
Broker and agency services, and insurance-related services | Specialty Program | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	0.5	1.8
Asset management, and business services
Disaggregation of Revenue [Line Items]
Revenue	9.2	34.4
Asset management, and business services | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	9.2	34.4
Asset management, and business services | Small Commercial Business | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	0	0
Asset management, and business services | Specialty Risk and Extended Warranty | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	0	0
Asset management, and business services | Specialty Program | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	0	0
United States
Disaggregation of Revenue [Line Items]
Revenue	11.5	106.5
United States | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	2	9
United States | Small Commercial Business | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	1.9	23.7
United States | Specialty Risk and Extended Warranty | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	7.1	72
United States | Specialty Program | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	0.5	1.8
International
Disaggregation of Revenue [Line Items]
Revenue	28.4	90.3
International | Corporate and Other
Disaggregation of Revenue [Line Items]
Revenue	7.2	25.4
International | Small Commercial Business | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	0	0
International | Specialty Risk and Extended Warranty | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	21.2	64.9
International | Specialty Program | Operating Segments
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 0

Divestitures (Net Assets) (Deta

Divestitures (Net Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Disposal Group, Including Discontinued Operation, Assets [Abstract]
Total assets held for sale	$ 0	$ 900.9
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Total liabilities held for sale	$ 0	761.7
US Based Fee Businesses | Disposal Group, Held-for-sale, Not Discontinued Operations
Disposal Group, Including Discontinued Operation, Assets [Abstract]
Fixed maturity securities, available for sale		35.3
Other investments		0.2
Cash and cash equivalents		56.1
Restricted cash and cash equivalents		33.8
Accrued interest and dividends		0.3
Premiums receivable, net		33.9
Deferred policy acquisition costs		211.5
Property, equipment and software, net		4.2
Goodwill		188.3
Intangible assets		171.9
Other assets		165.4
Total assets held for sale		900.9
Disposal Group, Including Discontinued Operation, Liabilities [Abstract]
Funds held under reinsurance treaties		1.3
Accrued expenses and other liabilities		760.4
Total liabilities held for sale		$ 761.7

Divestitures (Narrative) (Detai

Divestitures (Narrative) (Details) - USD ($) $ in Millions	Feb. 28, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) gain on sales of U.S.-based fee businesses		$ (7.8)	$ 0	$ 716.3	$ 0
Equity in (loss) earnings of unconsolidated subsidiaries		(31.7)	$ 0	(31.7)	$ 73.5
Mayfield Holdings LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to acquire businesses	$ 933
Percentage of voting Interests acquired (in percentage)	49.00%
Consideration transferred, equity interests issued and issuable	$ 217
(Loss) gain on sales of U.S.-based fee businesses				724.1
Equity in (loss) earnings of unconsolidated subsidiaries		(31.7)		$ (31.7)
MH JV Holdings L.P. | Mayfield Holdings LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to acquire businesses	$ 225.8
Percentage of voting Interests acquired (in percentage)	51.00%
AMTCS holdings | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of investment		$ 7.8