Accounting Policies - Accumulated Other Comprehensive Loss by Component, Net of Tax (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 1,699,607
Other comprehensive (loss) income, net of tax	$ (41,249)	$ 35,889	(13,627)	$ (50,210)
Ending balance	1,722,537		1,722,537
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(227,349)
Other comprehensive (loss) before reclassifications			(10,119)
Amounts reclassified from accumulated other comprehensive income			0
Other comprehensive (loss) income, net of tax			(10,119)
Ending balance	(237,468)		(237,468)
Derivative contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(2,987)
Other comprehensive (loss) before reclassifications			(2,758)
Amounts reclassified from accumulated other comprehensive income			647
Other comprehensive (loss) income, net of tax			(2,111)
Ending balance	(5,098)		(5,098)
Pension and post retirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(46,383)
Other comprehensive (loss) before reclassifications			(2,293)
Amounts reclassified from accumulated other comprehensive income			896
Other comprehensive (loss) income, net of tax			(1,397)
Ending balance	(47,780)		(47,780)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(276,719)
Other comprehensive (loss) before reclassifications			(15,170)
Amounts reclassified from accumulated other comprehensive income			1,543
Other comprehensive (loss) income, net of tax			(13,627)
Ending balance	$ (290,346)		$ (290,346)