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Income Taxes , Provision for Income Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Current:      
Federal $ 80.7 $ 38.6 $ 11.0
State 2.5 8.1 0.1
Foreign 23.3 13.6 11.4
Total current 106.5 60.3 22.5
Deferred:      
Federal (90.2) (8.1) 40.6
State (1.1) (0.8) (6.0)
Foreign (1.1) 1.8 (2.8)
Total deferred (92.4) (7.1) 31.8
Provision for income taxes $ 14.1 $ 53.2 $ 54.3