Derivative Financial Instruments and Fair Value Measurements - Fair Value of Derivative and Non-Derivative Assets and Liabilities on the Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Assets	$ 0.0	$ 0.0
Liabilities	1,050.3	819.2
Not designated as hedging instrument | Foreign currency forward contracts | Accounts receivable, net
Derivatives, Fair Value [Line Items]
Assets	0.0	0.0
Not designated as hedging instrument | Foreign currency forward contracts | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liabilities	0.0	0.0
Designated as hedging instrument | Euro Notes | Long-term debt
Derivatives, Fair Value [Line Items]
Liabilities	$ 1,050.3	$ 819.2