XML 108 R95.htm IDEA: XBRL DOCUMENT v3.20.4
Income Taxes - Reconciliation of Beginning and End of Period Amounts of Gross Unrecognized Tax Benefits (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Balance at beginning of period $ 191.9 $ 20.1 $ 46.6
Increase related to prior periods 2.5 12.3 4.0
Decrease related to prior periods (4.5) (1.2) (0.7)
Increase related to current periods 5.0 8.5  
Decrease related to settlements with taxing authorities (0.9) (1.9) (3.9)
Decrease related to lapse in statutes of limitations (2.6) (15.0) (25.9)
Increase (decrease) related to the Acquisition (0.9) 169.1  
Balance at end of period $ 190.5 $ 191.9 $ 20.1