Stockholders' Equity Note Disclosure [Text Block] | 11. We have 2,000,000,000 shares of authorized common stock as of September 30, 2021 and December 31, 2020 . Our common shares have rights to any dividend declared by the board of directors (the "Board"), subject to any preferential or other rights of any outstanding preferred stock, and voting rights to elect all current members of the Board. At September 30, 2021 and December 31, 2020, We have 80,000,000 shares of authorized preferred stock, par value $0.001 per share. The preferred shares have preferential rights over the common shares with respect to dividends and net distribution upon liquidation. We did not September 30, 2021 and December 31, 2020. On February 17, 2021, April 28, 2021, July 28, 2021, March 15, 2021, June 15, 2021, September 15, 2021, nine September 30, 2021 2020 and recorded as a reduction to retained earnings, respectively. Share Repurchase Program Since the introduction of share repurchase as a feature of our capital management strategies in 2010, August 17, 2021. September 30, 2021 , we had $678.8 million available to repurchase shares through our Repurchase Program. We have no 2021 "2021 2013 "2013 2009 "2009 no may In December 2020, March 2021, June 2021, 815 40, Contracts in Entity's Own Equity ("ASC 815 40" zero January 4, 2021, April 1, 2021, July 1, 2021, February 2021, May 2021, September 2021, nine months ended September 30, 2021 . These repurchases of 1,749,644 shares for the nine months ended September 30, 2021 resulted in a reduction of outstanding shares used to calculate the weighted average common shares outstanding for basic and diluted earnings per share ("EPS"). During the nine months ended September 30, 2021 , we repurchased 2,192,780 shares of common stock with an aggregate value of $400.0 million as part of the Repurchase Program, inclusive of the ASR, at a weighted average price of $182.41 per share. We utilized cash from operations and borrowings from our Credit Facility to fund these repurchases. Treasury Stock A s of September 30, 2021 , our treasury stock consisted of 382,587,968 shares of common stock, carried at cost. During the nine months ended September 30, 2021 , we transferred 790,324 shares of common stock from the treasury shares at a weighted average treasury stock price of $11.54 per share. Earnings Per Share Basic EPS is computed by dividing net income attributable to Verisk by the weighted average number of common shares outstanding during the period. The computation of diluted EPS is similar to the computation of basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding, using the treasury stock method, if the dilutive potential common shares, including vested and nonvested stock options, nonvested restricted stock awards, nonvested restricted stock units, nonvested performance awards consisting of performance share units ("PSU"), and nonvested deferred stock units, had been issued. The following is a presentation of the numerators and denominators of the basic and diluted EPS computations for the three nine September 30, 2021 2020 Three Months Ended September 30, Nine Months Ended September 30, 2021 2020 2021 2020 Numerator used in basic and diluted EPS: Net income attributable to Verisk $ 201.7 $ 185.8 $ 524.3 $ 536.5 Denominator: Weighted average number of common shares used in basic EPS 161,366,544 162,502,191 162,005,382 162,589,473 Effect of dilutive shares: Potential common shares issuable from stock options and stock-based awards 1,426,247 3,229,035 1,419,967 2,930,426 Weighted average number of common shares and dilutive potential common shares used in diluted EPS 162,792,791 165,731,226 163,425,349 165,519,899 The potential shares of common stock that were excluded from diluted EPS were 740,090 and 40,741 for the three September 30, 2021 2020 , and 824,067 and 675,324 for t nine September 30, 2021 2020 Accumulated Other Comprehensive Losses The following is a summary of accumulated other comprehensive losses as of September 30, 2021 December 31, 2020 2021 2020 Foreign currency translation adjustment $ (347.4 ) $ (292.2 ) Pension and postretirement adjustment, net of tax (81.2 ) (83.5 ) Accumulated other comprehensive losses $ (428.6 ) $ (375.7 ) The before tax and after tax amounts of other comprehensive income (loss) for the three nine September 30, 2021 2020 Before Tax Tax (Expense) Benefit After Tax For the Three Months Ended September 30, 2021 Foreign currency translation adjustment $ (80.4 ) $ — $ (80.4 ) Pension and postretirement adjustment before reclassifications 2.1 (0.6 ) 1.5 Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses (1) (1.1 ) 0.3 (0.8 ) Pension and postretirement adjustment 1.0 (0.3 ) 0.7 Total other comprehensive loss $ (79.4 ) $ (0.3 ) $ (79.7 ) For the Three Months Ended September 30, 2020 Foreign currency translation adjustment $ 115.0 $ — $ 115.0 Pension and postretirement adjustment before reclassifications 3.5 (0.8 ) 2.7 Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses (1) (1.8 ) 0.4 (1.4 ) Pension and postretirement adjustment 1.7 (0.4 ) 1.3 Total other comprehensive income $ 116.7 $ (0.4 ) $ 116.3 Before Tax Tax (Expense) Benefit After Tax For the Nine Months Ended September 30, 2021 Foreign currency translation adjustment $ (55.2 ) $ — $ (55.2 ) Pension and postretirement adjustment before reclassifications 6.2 (1.6 ) 4.6 Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses (1) (3.1 ) 0.8 (2.3 ) Pension and postretirement adjustment 3.1 (0.8 ) 2.3 Total other comprehensive loss $ (52.1 ) $ (0.8 ) $ (52.9 ) For the Nine Months Ended September 30, 2020 Foreign currency translation adjustment $ (57.7 ) $ — $ (57.7 ) Pension and postretirement adjustment before reclassifications 9.7 (2.3 ) 7.4 Amortization of net actuarial loss and prior service benefit reclassified from accumulated other comprehensive losses (1) (4.9 ) 1.2 (3.7 ) Pension and postretirement adjustment 4.8 (1.1 ) 3.7 Total other comprehensive loss $ (52.9 ) $ (1.1 ) $ (54.0 ) _______________ ( 1 These accumulated other comprehensive loss components, before tax, are included under "Cost of revenues" and "Selling, general and administrative" in our accompanying condensed consolidated statements of operations. These components are also included in the computation of net periodic (benefit) cost (see Note 13 |