Reporting Segments and Related Information (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Customer sales										$ 8,023.2	$ 8,305.1	$ 7,436.6
Net sales		$ 2,123.1	$ 1,884.0	$ 2,031.9	$ 1,984.2	$ 1,991.9	$ 2,032.1	$ 2,197.0	$ 2,084.1	8,023.2	8,305.1	7,436.6
Year-end assets		8,841.5				7,228.0				8,841.5	7,228.0	6,917.0
Depreciation and amortization										320.2	330.4	299.4
Long-lived asset expenditures	[1]									577.3	563.0	417.8
Operating Segments [Member]
Segment Reporting Information [Line Items]
Customer sales										8,023.2	8,305.1	7,436.6
Net sales										8,023.2	8,305.1	7,436.6
Year-end assets		7,703.1				5,719.7				7,703.1	5,719.7	5,305.7
Depreciation and amortization										297.2	308.1	279.6
Long-lived asset expenditures	[1]									554.2	539.0	400.4
Engine [Member]
Segment Reporting Information [Line Items]
Customer sales										5,466.5	5,673.7	4,990.1
Inter-segment sales										33.5	32.2	32.0
Net sales										5,500.0	5,705.9	5,022.1
Year-end assets		4,018.0				3,936.2				4,018.0	3,936.2	3,519.1
Depreciation and amortization										200.2	215.3	189.1
Long-lived asset expenditures	[1]									332.4	349.8	277.5
Drivetrain [Member]
Segment Reporting Information [Line Items]
Customer sales										$ 2,556.7	$ 2,631.4	$ 2,446.5
Inter-segment sales
Net sales										$ 2,556.7	$ 2,631.4	$ 2,446.5
Year-end assets		3,685.1				1,783.5				3,685.1	1,783.5	1,786.6
Depreciation and amortization										97.0	92.8	90.5
Long-lived asset expenditures	[1]									221.8	189.2	122.9
Inter-segment eliminations [Member]
Segment Reporting Information [Line Items]
Inter-segment sales										(33.5)	(32.2)	(32.0)
Net sales										(33.5)	(32.2)	(32.0)
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Year-end assets	[2]	$ 1,138.4				$ 1,508.3				1,138.4	1,508.3	1,611.3
Depreciation and amortization	[2]									23.0	22.3	19.8
Long-lived asset expenditures	[1],[2]									$ 23.1	$ 24.0	$ 17.4

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

[2] Corporate assets include investments and other long-term receivables and deferred income taxes.