Financial Instruments and Fair Value Measurement Narrative (Details)	12 Months Ended
	Dec. 31, 2016 USD ($) derivate investment	Dec. 31, 2015 USD ($) investment	Dec. 31, 2014 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments carried at fair value	$ 67,600,000	$ 61,700,000
Purchase of trading securities held-for-investment	1,400,000	1,000,000
Proceeds from the sale of trading securities held-for-investment	$ 1,600,000	300,000
Number of foreign exchange contracts held (foreign_exchange_contract) | derivate	51
Hedge ineffectiveness with respect to forward exchange cash flow hedges	$ 0	0	$ 0
Long-term debt	990,500,000	595,900,000
Long-term debt, fair value	1,017,800,000	$ 630,500,000
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	400,000.0
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, notional amount	$ 1,200,000.0
Unobservable inputs for which little or no market data exists (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