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Income Taxes Income tax provision (benefit) from continuing operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
U.S. federal $ 105.8 $ 60.4 $ (2.4)
State and local 4.4 4.4 (0.5)
Foreign 7.9 10.4 2.6
Net current tax provision (benefit) 118.1 75.2 (0.3)
U.S federal (19.3) (48.1) (1.1)
State and local 8.0 1.2 (1.8)
Foreign 38.2 11.7 (26.6)
Net valuation allowance increase (decrease) (25.9) (20.2) 27.1
Deferred income tax expense (benefit) 1.0 (55.4) (2.4)
Provision (benefit) for income taxes 119.1 19.8 (2.7)
Income Tax Refunds 0.3 0.8 0.1
Income Taxes Paid 143.1 8.7 $ 16.0
Income Taxes Receivable 2.2 1.7  
Income taxes payable $ 4.5 $ 31.3