Financial Instruments and Fair Value Measurement - Narrative (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) derivate investment	Dec. 31, 2017 USD ($) investment	Dec. 31, 2016 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments carried at fair value	$ 65,500,000	$ 72,200,000
Purchase of trading securities held-for-investment	2,700,000	2,100,000
Proceeds from the sale of trading securities held-for-investment	$ 1,500,000	300,000
Number of foreign exchange contracts held (foreign_exchange_contract) | derivate	36
Hedge ineffectiveness with respect to forward exchange cash flow hedges	$ 0	0	$ 0
Long-term debt, current portion	25,000,000
Long-term debt	1,762,100,000
Long-term Debt	1,737,100,000	987,100,000
Long-term debt, fair value	1,688,100,000	$ 1,013,200,000
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	500,000.0
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	$ 1,500,000.0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of available-for-sale securities (investment) | investment	1	1
Customer Concentration Risk
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Concentration risk, percentage	38.00%