Hedging Transaction and Derivative Instruments - Fair Value of Derivative Instruments, Balance Sheet Location (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive loss	$ (108.7)	$ (132.1)	$ (116.6)	$ (126.2)
Cash Flow Hedging | Designated as hedging instrument | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	0.6	0.0
Cash Flow Hedging | Designated as hedging instrument | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative liability	0.6	3.6
Cash Flow Hedging | Designated as hedging instrument | Other noncurrent liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	0.0	0.2
Economic Hedge | Not designated as hedging instrument | Other accrued expenses
Derivatives, Fair Value [Line Items]
Derivative liability	0.2	0.0
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive loss	$ 0.1	$ (3.2)	$ (1.9)	$ (1.6)