v3.22.0.1
INCOME TAXES - Effective income tax rate on earnings (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of effective tax rate on earnings (loss) from continuing operations before income taxes and the U.S. federal income tax statutory rate        
Income tax expense (benefit) at the federal statutory rate   $ (268.8) $ (951.2) $ (36.0)
Effect of:        
State income taxes   (46.9) (89.5) (7.2)
Increase in reserve for uncertain tax positions   (3.3) (1.9) 8.4
Federal and state credits   (2.3) (3.6) (6.5)
Permanent items - goodwill impairment     456.3  
Permanent items - other   (3.1) 13.2 (6.6)
Foreign rate differential   4.3 19.7 11.8
Impact of UK tax rate change   (34.3)    
Other   (5.0) 1.7 (10.6)
Valuation allowance   349.2 615.2 24.2
Income tax provision (benefit)   $ (10.2) $ 59.9 $ (22.5)
Effective income tax rate (as a percent)   0.80% (1.30%) 13.10%
Reduction of uncertain tax positions and net discrete tax benefit   $ 2.2    
Tax Authority Spain | Foreign        
Effect of:        
Income tax provision (benefit) $ 40.1