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	Sep. 30, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Assets	$ 11.9	$ 0.1
Liabilities	1,045.7	1,053.0
Not designated as hedging instrument | Foreign currency forward contracts | Accounts receivable, net
Derivatives, Fair Value [Line Items]
Assets	0.1	0.1
Not designated as hedging instrument | Foreign currency forward contracts | Accrued liabilities
Derivatives, Fair Value [Line Items]
Liabilities	0.0	0.1
Cash flow hedge | Designated as hedging instrument | Cross-currency swap | Prepaid expenses and other assets
Derivatives, Fair Value [Line Items]
Assets	9.0	0.0
Net Investment Hedging | Designated as hedging instrument | Cross-currency swap | Prepaid expenses and other assets
Derivatives, Fair Value [Line Items]
Assets	2.8	0.0
Net Investment Hedging | Designated as hedging instrument | Euro Notes | Long-term debt
Derivatives, Fair Value [Line Items]
Liabilities	$ 1,045.7	$ 1,052.9