Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenue	$ 983,913	$ 941,644	$ 958,450	$ 937,497	$ 1,010,821	$ 920,489	$ 950,662	$ 909,363	$ 3,821,504		$ 3,791,335		$ 3,823,713
Interest expense									(95,291)		(114,740)		(115,228)
Interest income									4,403		5,472		7,982
Tax (benefit) provision	33,134	25,310	46,335	8,036	25,922	10,032	24,218	17,795	112,815		77,967		114,287
Net income	67,122	136,882	98,859	49,267	94,682	(933)	(4,639)	72,100	352,130		161,210		463,539
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at				(574,556)				(681,213)	(574,556)		(681,213)		(661,645)
Other comprehensive income (loss) before reclassifications									(297,246)	[1]	75,387	[1]	(71,590)	[1]
Amounts reclassified from accumulated other comprehensive income (loss)									25,646	[1],[2],[3]	31,270	[1],[2]	52,022	[1],[2]
Net other comprehensive income (loss)									(271,600)		106,657		(19,568)
Balance at	(846,156)				(574,556)				(846,156)		(574,556)		(681,213)
Gains (losses) on cash flow hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at				(6,380)				(7,777)	(6,380)		(7,777)		(8,438)
Other comprehensive income (loss) before reclassifications									1,146	[1]	(147)	[1]	104	[1]
Amounts reclassified from accumulated other comprehensive income (loss)									545	[1],[2],[3]	1,544	[1],[2]	557	[1],[2]
Net other comprehensive income (loss)									1,691		1,397		661
Balance at	(4,689)				(6,380)				(4,689)		(6,380)		(7,777)
Unrealized gains (losses) on available for sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at				(1,769)				4,513	(1,769)		4,513		4,387
Other comprehensive income (loss) before reclassifications									4,010	[1]	(7,000)	[1]	1,240	[1]
Amounts reclassified from accumulated other comprehensive income (loss)									725	[1],[2],[3]	718	[1],[2]	(1,114)	[1],[2]
Net other comprehensive income (loss)									4,735		(6,282)		126
Balance at	2,966				(1,769)				2,966		(1,769)		4,513
Defined benefit pension plans and nonpension postretirement benefit plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at				(601,421)				(759,199)	(601,421)		(759,199)		(741,546)
Other comprehensive income (loss) before reclassifications									(212,818)	[1]	122,023	[1]	(70,232)	[1]
Amounts reclassified from accumulated other comprehensive income (loss)									28,160	[1],[2],[3]	35,755	[1],[2]	52,579	[1],[2]
Net other comprehensive income (loss)									(184,658)		157,778		(17,653)
Balance at	(786,079)				(601,421)				(786,079)		(601,421)		(759,199)
Foreign currency items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at				35,014				81,250	35,014		81,250		83,952
Other comprehensive income (loss) before reclassifications									(89,584)	[1]	(39,489)	[1]	(2,702)	[1]
Amounts reclassified from accumulated other comprehensive income (loss)									(3,784)	[1],[2],[3]	(6,747)	[1],[2]	0	[1],[2]
Net other comprehensive income (loss)									(93,368)		(46,236)		(2,702)
Balance at	(58,354)				35,014				(58,354)		35,014		81,250
Amount Reclassified from AOCI | Gains (losses) on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenue									1,276		(835)		1,298
Cost of sales									(140)		332		(185)
Interest expense									(2,028)		(2,028)		(2,028)
Total before tax									(892)		(2,531)		(915)
Tax (benefit) provision									(347)		(987)		(358)
Net income									(545)		(1,544)		(557)
Amount Reclassified from AOCI | Unrealized gains (losses) on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest income									(1,149)		(1,140)		1,768
Tax (benefit) provision									(424)		(422)		654
Net income									(725)		(718)		1,114
Amount Reclassified from AOCI | Defined benefit pension plans and nonpension postretirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Transition asset									10		9		10
Prior service (costs) credit									(111)		(620)		809
Actuarial losses									(43,702)		(54,372)		(75,274)
Total before tax									(43,803)		(54,983)		(74,455)
Tax (benefit) provision									(15,643)		(19,228)		(21,876)
Net income									$ (28,160)		$ (35,755)		$ (52,579)

[1] Amounts are net of tax. Amounts in parentheses indicate debits to AOCI.

[2] See table above for additional details of these reclassifications.

[3] Foreign currency item amount represents the recognition of deferred translation upon the sale of certain businesses.