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Income Tax Provision - (Benefit) Provision for Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current:      
Federal $ 0.0 $ 0.0 $ 1.1
State and local 0.1 0.3 0.1
Foreign 0.4 0.7 0.6
Current tax provision (benefit) 0.5 1.0 1.8
Deferred:      
Federal (14.4) 0.4 (0.4)
State and local (2.0) 0.0 0.0
Foreign (0.2) 0.4 0.1
Deferred tax provision (benefit) (16.6) 0.8 (0.3)
Provision (benefit) for incomes taxes $ (16.1) $ 1.8 $ 1.5