Segment Information (Details 1) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Geographic information
Product	$ 996,600,000	$ 975,800,000	$ 956,700,000	$ 907,100,000	$ 909,800,000	$ 876,900,000	$ 859,200,000	$ 824,200,000	$ 3,836,117,000	$ 3,470,056,000	$ 3,152,941,000
Revenues from unconsolidated joint business									996,600,000	1,077,200,000	1,094,900,000
Other revenues from external customers	72,600,000	67,700,000	35,500,000	40,100,000	51,400,000	41,000,000	47,100,000	29,700,000	215,920,000	169,123,000	129,544,000
Long-lived assets	1,838,400,000				1,826,200,000				1,838,400,000	1,826,200,000	1,805,400,000
Asia [Member]
Geographic information
Product									88,700,000	69,000,000	47,900,000
Revenues from unconsolidated joint business									30,700,000	26,000,000	24,100,000
Long-lived assets	5,300,000				5,400,000				5,300,000	5,400,000	3,600,000
Europe [Member]
Geographic information
Product									1,163,300,000	1,090,700,000	913,700,000
Revenues from unconsolidated joint business									29,900,000	95,300,000	190,200,000
Other revenues from external customers									28,300,000	32,600,000	26,200,000
Long-lived assets	816,600,000				717,400,000				816,600,000	717,400,000	705,600,000
Other [Member]
Geographic information
Product									251,800,000	203,600,000	178,500,000
Revenues from unconsolidated joint business									57,200,000	49,600,000	41,400,000
Long-lived assets	2,400,000				1,600,000				2,400,000	1,600,000	2,100,000
U.S [Member]
Geographic information
Product									1,954,800,000	1,744,400,000	1,638,000,000
Revenues from unconsolidated joint business									878,800,000	906,300,000	839,200,000
Other revenues from external customers									187,000,000	136,000,000	102,800,000
Long-lived assets	1,012,500,000				1,100,300,000				1,012,500,000	1,100,300,000	1,092,700,000
Germany [Member]
Geographic information
Product									377,500,000	362,400,000	374,800,000
Other revenues from external customers									600,000	500,000	500,000
Long-lived assets	$ 1,600,000				$ 1,500,000				$ 1,600,000	$ 1,500,000	$ 1,400,000