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Income Taxes - Income Tax Provision (Benefit) (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Current:          
United States $ 12.3   $ 7.2   $ 0.1
Non-United States 0.7   1.0   1.4
State and local 2.6   2.7   0.0
Total current 15.6   10.9   1.5
Deferred:          
United States (2.5)   (8.8)   1.4
Non-United States (0.4)   (0.1)   (0.3)
State and local (2.2)   0.7   1.8
Total deferred (5.1)   (8.2)   2.9
Provision for income taxes $ 10.5 $ 5.4 $ 2.7 $ 9.5 $ 4.4