Fair Value Measurements and Risk - Narrative (Details) - 3 months ended Mar. 31, 2018 € in Millions	EUR (€) Currency country	USD ($) Currency country
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of countries in which entity operates | country	60	60
Number of currencies used | Currency	30	30
Maximum Remaining Maturity of Foreign Currency Derivatives	36 months
Deferred intercompany royalties designated as hedging instrument	€ 28.1
Term Loan B (EUR)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Term loan principal designated as hedging instrument	€ 80.1
Currency contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total contract value | $		$ 187,900,000
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total contract value | $		$ 250,000,000
Fixed interest rate	2.393%	2.393%
Currency Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total contract value	€ 170.0