Reporting Segments and Related Information (Details) (USD $) In Millions, unless otherwise specified	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
Segment Reporting Information [Line Items]
Net sales	$ 1,773.7		$ 1,791.8	$ 1,818.8	$ 1,730.4	$ 1,533.4		$ 1,410.9	$ 1,421.7	$ 1,286.8	$ 7,114.7		$ 5,652.8		$ 3,961.8
Inter-segment sales											0		0		0
Net sales by for reportable segment											7,114.7		5,652.8		3,961.8
Year-end assets	5,958.6					5,555.0					5,958.6		5,555.0		4,811.4
Depreciation and amortization											283.0		252.9		260.9
Long-lived asset expenditures											393.7	[1]	276.6	[1]	172.0	[1]
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales											7,114.7		5,652.8		3,961.8
Inter-segment sales											0		0		0
Net sales by for reportable segment											7,114.7		5,652.8		3,961.8
Year-end assets	4,891.8					4,508.2					4,891.8		4,508.2		3,916.9
Depreciation and amortization											268.6		248.0		254.6
Long-lived asset expenditures											380.2	[1]	264.8	[1]	160.2	[1]
Engine [Member]
Segment Reporting Information [Line Items]
Net sales											5,030.2		4,041.4		2,868.3
Inter-segment sales											20.4		19.4		14.9
Net sales by for reportable segment											5,050.6		4,060.8		2,883.2
Year-end assets	3,329.0					3,277.7					3,329.0		3,277.7		2,812.8
Depreciation and amortization											188.6		184.4		188.7
Long-lived asset expenditures											264.3	[1]	181.3	[1]	115.6	[1]
Drivetrain [Member]
Segment Reporting Information [Line Items]
Net sales											2,084.5		1,611.4		1,093.5
Inter-segment sales											0		0		0
Net sales by for reportable segment											2,084.5		1,611.4		1,093.5
Year-end assets	1,562.8					1,230.5					1,562.8		1,230.5		1,104.1
Depreciation and amortization											80.0		63.6		65.9
Long-lived asset expenditures											115.9	[1]	83.5	[1]	44.6	[1]
Inter-segment eliminations [Member]
Segment Reporting Information [Line Items]
Net sales											0		0		0
Inter-segment sales											(20.4)		(19.4)		(14.9)
Net sales by for reportable segment											(20.4)		(19.4)		(14.9)
Year-end assets	0					0					0		0		0
Depreciation and amortization											0		0		0
Long-lived asset expenditures											0	[1]	0	[1]	0	[1]
Corporate [Member]
Segment Reporting Information [Line Items]
Net sales											0	[2]	0	[2]	0	[2]
Inter-segment sales											0	[2]	0	[2]	0	[2]
Net sales by for reportable segment											0	[2]	0	[2]	0	[2]
Year-end assets	1,066.8	[2]				1,046.8	[2]				1,066.8	[2]	1,046.8	[2]	894.5	[2]
Depreciation and amortization											14.4	[2]	4.9	[2]	6.3	[2]
Long-lived asset expenditures											$ 13.5	[1],[2]	$ 11.8	[1],[2]	$ 11.8	[1],[2]

[1] Long-lived asset expenditures include capital expenditures and tooling outlays.

[2] Corporate assets include equity in affiliates’, investment and advances and deferred income taxes. The December 31, 2009 assets are net of trade receivables securitized and sold to third parties.