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Business Segment Information (Reportable Segments) (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 segments	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Number of operating segments (in segments)									3us-gaap_NumberOfOperatingSegments
Summarized financial information of the reportable segments
Sales to external customers	$ 1,381,400us-gaap_SalesRevenueNet	$ 1,204,000us-gaap_SalesRevenueNet	$ 1,224,400us-gaap_SalesRevenueNet	$ 1,068,100us-gaap_SalesRevenueNet	$ 1,389,400us-gaap_SalesRevenueNet	$ 1,229,100us-gaap_SalesRevenueNet	$ 1,239,500us-gaap_SalesRevenueNet	$ 1,096,600us-gaap_SalesRevenueNet	$ 4,877,885us-gaap_SalesRevenueNet	$ 4,954,619us-gaap_SalesRevenueNet	$ 4,751,339us-gaap_SalesRevenueNet
Intersegment sales									0us-gaap_Revenues	0us-gaap_Revenues	0us-gaap_Revenues
Segment operating income									789,832us-gaap_OperatingIncomeLoss	760,283us-gaap_OperatingIncomeLoss	675,778us-gaap_OperatingIncomeLoss
Depreciation and amortization									110,277	106,392	107,226
Identifiable assets	4,968,020us-gaap_Assets				5,036,733us-gaap_Assets				4,968,020us-gaap_Assets	5,036,733us-gaap_Assets	4,810,958us-gaap_Assets
Capital expenditures									132,619	139,090	135,539
Subtotal—Reportable Segments
Summarized financial information of the reportable segments
Sales to external customers									4,877,885	4,954,619	4,751,339
Intersegment sales									134,812	148,357	162,784
Segment operating income									875,217	846,964	749,006
Depreciation and amortization									101,223	97,206	97,833
Identifiable assets	4,491,753				4,608,201				4,491,753	4,608,201	4,454,753
Capital expenditures									121,768	133,029	127,628
EPD
Summarized financial information of the reportable segments
Sales to external customers									2,396,068	2,473,731	2,338,527
Intersegment sales									67,974	63,365	64,621
Segment operating income									427,080	423,339	396,082
Depreciation and amortization									48,765	46,494	48,007
Identifiable assets	2,249,033				2,260,961				2,249,033	2,260,961	2,223,791
Capital expenditures									65,762	75,379	64,038
IPD
Summarized financial information of the reportable segments
Sales to external customers									872,563	873,389	863,941
Intersegment sales									60,364	76,779	89,957
Segment operating income									125,292	115,658	99,526
Depreciation and amortization									17,000	14,122	13,408
Identifiable assets	774,964				827,155				774,964	827,155	745,276
Capital expenditures									18,510	17,445	17,351
FCD
Summarized financial information of the reportable segments
Sales to external customers									1,609,254	1,607,499	1,548,871
Intersegment sales									6,474	8,213	8,206
Segment operating income									322,845	307,967	253,398
Depreciation and amortization									35,458	36,590	36,418
Identifiable assets	1,467,756				1,520,085				1,467,756	1,520,085	1,485,686
Capital expenditures									37,496	40,205	46,239
Eliminations and All Other
Summarized financial information of the reportable segments
Sales to external customers									0	0	0
Intersegment sales									(134,812)	(148,357)	(162,784)
Segment operating income									(85,385)	(86,681)	(73,228)
Depreciation and amortization									9,054	9,186	9,393
Identifiable assets	476,267				428,532				476,267	428,532	356,205
Capital expenditures									$ 10,851	$ 6,061	$ 7,911