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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Income tax expense (benefit) $ 2.4 $ (43.9) $ 11.2 $ (40.6)  
Effective income tax rate, continuing operations 13.00% 17.10% 17.00% 5.40%  
Unrecognized tax benefit liability, including penalties and accrued interest $ 22.5   $ 22.5   $ 22.2
UNITED STATES          
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount   $ 36.0      
Settlement with Taxing Authority [Member]          
Other Tax Expense (Benefit)   (6.8)      
CARES Act [Member]          
Other Tax Expense (Benefit)   $ (7.0)   $ (7.5)