Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | | |
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Investments, Fair Value Disclosure | $ 677.5 | $ 435.4 | $ 639.6 | $ 340.3 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Investments, Fair Value Disclosure | 70.1 | | 84.5 | |
Foreign currency forward contracts receivable | 0 | | 0 | |
Loans Receivable, Fair Value Disclosure | 0 | | 0 | |
Deferred compensation plan assets | 0 | | 0 | |
Mortgage banking derivative asset | 0 | | 0 | |
Total assets at fair value | 70.1 | | 84.5 | |
Foreign currency forward contracts payable | 0 | | 0 | |
Deferred compensation plan liabilities | 0 | | 0 | |
Business Combination, Contingent Consideration, Liability | 0 | | 0 | |
Mortgage banking derivative liabilities | 0 | | 0 | |
Total liabilities at fair value | 0 | | 0 | |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Investments, Fair Value Disclosure | 0 | | 0 | |
Foreign currency forward contracts receivable | 19.3 | | 15.9 | |
Loans Receivable, Fair Value Disclosure | 701.7 | | 822.3 | |
Deferred compensation plan assets | 558.3 | | 528.8 | |
Mortgage banking derivative asset | 0 | | 0 | |
Total assets at fair value | 1,279.3 | | 1,367 | |
Foreign currency forward contracts payable | 4 | | 0.8 | |
Deferred compensation plan liabilities | 493.8 | | 513 | |
Business Combination, Contingent Consideration, Liability | 0 | | 0 | |
Mortgage banking derivative liabilities | 0 | | 0 | |
Total liabilities at fair value | 497.8 | | 513.8 | |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Derivative Assets (Liabilities), at Fair Value, Net | 37.1 | 32.9 | 21.9 | 13.7 |
Investments, Fair Value Disclosure | 220 | 140.1 | 182.3 | 59.3 |
Foreign currency forward contracts receivable | 0 | | 0 | |
Loans Receivable, Fair Value Disclosure | 0 | | 0 | |
Deferred compensation plan assets | 0 | | 0 | |
Mortgage banking derivative asset | 101.3 | | 60.4 | |
Total assets at fair value | 321.3 | | 242.7 | |
Foreign currency forward contracts payable | 0 | | 0 | |
Deferred compensation plan liabilities | 0 | | 0 | |
Business Combination, Contingent Consideration, Liability | 79.5 | 68.2 | 84.1 | $ 85.7 |
Mortgage banking derivative liabilities | 64.2 | | 38.5 | |
Total liabilities at fair value | 143.7 | | $ 122.6 | |
Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 17.2 | 31.8 | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | 0 | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 20.5 | 49.1 | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 0 | (0.1) | | |
Derivative [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | 20.4 | 18.9 | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | 0 | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 37.6 | 41.1 | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | (42.8) | (40.8) | | |
Earn-out Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | (0.7) | (0.1) | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | (0.1) | (0.4) | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 2 | 3.8 | | |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | $ (5.8) | $ (20.8) | | |