Annual report pursuant to Section 13 and 15(d)

Income Taxes Income Taxes - Schedule of Valuation Allowance (Details)

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Income Taxes Income Taxes - Schedule of Valuation Allowance (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items]    
Valuation allowance $ 41.1 $ 28.2
Foreign    
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items]    
Valuation allowance 23.5 23.3
State    
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items]    
Valuation allowance 13.8 4.9
Federal    
Valuation Allowance for Impairment of Recognized Servicing Assets [Line Items]    
Valuation allowance $ 3.8 $ 0.0