Reporting Segments and Related Information (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales		$ 2,572.8	$ 2,478.5	$ 2,694.0	$ 2,784.3	$ 2,586.4	$ 2,416.2	$ 2,389.7	$ 2,407.0	$ 10,529.6	$ 9,799.3	$ 9,071.0
Year-end assets		10,095.3				9,787.6				10,095.3	9,787.6	8,834.7
Depreciation and amortization										431.3	407.8	391.4
Long-lived asset expenditures										546.6	560.0	500.6
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales										10,529.6	9,799.3	9,071.0
Year-end assets		8,650.6				8,636.7				8,650.6	8,636.7	7,347.0
Depreciation and amortization										401.3	379.7	366.4
Long-lived asset expenditures										532.5	547.1	481.5
Engine [Member]
Segment Reporting Information [Line Items]
Net sales										6,447.4	6,061.5	5,590.1
Year-end assets		4,730.7				4,732.9				4,730.7	4,732.9	4,134.6
Depreciation and amortization										225.7	218.8	211.9
Long-lived asset expenditures										278.1	305.5	298.7
Drivetrain [Member]
Segment Reporting Information [Line Items]
Net sales										4,139.4	3,790.3	3,523.7
Year-end assets		3,919.9				3,903.8				3,919.9	3,903.8	3,212.4
Depreciation and amortization										175.6	160.9	154.5
Long-lived asset expenditures										254.4	241.6	182.8
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Year-end assets	[1]	$ 1,444.7				$ 1,150.9				1,444.7	1,150.9	1,487.7
Depreciation and amortization	[1]									30.0	28.1	25.0
Long-lived asset expenditures	[1]									14.1	12.9	19.1
Reportable Geographical Components [Member] | Engine [Member]
Segment Reporting Information [Line Items]
Net sales										6,389.9	6,009.0	5,547.3
Reportable Geographical Components [Member] | Drivetrain [Member]
Segment Reporting Information [Line Items]
Net sales										4,139.7	3,790.3	3,523.7
Consolidation, Eliminations [Member]
Segment Reporting Information [Line Items]
Net sales										(57.2)	(52.5)	(42.8)
Intersegment Eliminations [Member] | Engine [Member]
Segment Reporting Information [Line Items]
Net sales										57.5	52.5	42.8
Intersegment Eliminations [Member] | Drivetrain [Member]
Segment Reporting Information [Line Items]
Net sales										$ (0.3)	$ 0.0	$ 0.0

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