Financial Instruments (Details)	3 Months Ended				3 Months Ended				3 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 31, 2014 USD ($)	Mar. 31, 2015 Not Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2014 Not Designated as Hedging Instrument [Member] USD ($)	Mar. 31, 2015 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] USD ($)	Mar. 31, 2014 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2014 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] USD ($)	Dec. 31, 2014 Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] EUR (€)	Mar. 31, 2015 3.24% $100 Million Interest Rate Swap [Member] Designated as Hedging Instrument [Member] USD ($)	Mar. 31, 2014 3.24% $100 Million Interest Rate Swap [Member] Designated as Hedging Instrument [Member] USD ($)	Mar. 31, 2015 2.52% $50 Million Interest Rate Swap [Member] Designated as Hedging Instrument [Member] USD ($)	Mar. 31, 2015 2.25% $100 Million Interest Rate Swap [Member] Designated as Hedging Instrument [Member] USD ($)	Mar. 31, 2015 Derivative Maturing in 2015 [Member] Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] USD ($)	Mar. 31, 2015 Derivative Maturing in 2015 [Member] Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] EUR (€)	Mar. 31, 2015 Maturing in 2016 [Member] Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] USD ($)	Mar. 31, 2015 Maturing in 2016 [Member] Foreign Exchange Forward [Member] Designated as Hedging Instrument [Member] EUR (€)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount			$ 286,900,000	$ 325,400,000			$ 87,000,000						$ 72,600,000		$ 72,400,000
Notional Value Local Currency								71,500,000						66,700,000		66,500,000
Line Of Credit Facility Forecasted Borrowing Amount									100,000,000		50,000,000	100,000,000
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax					22,800,000	300,000
Derivative, Fixed Interest Rate									3.24%		2.52%	2.25%
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			9,000,000
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness					0	0			0	0
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ (9,300,000)	$ (200,000)