Revenue from Contracts with Customers Revenue from Contracts with Customers (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	Jan. 01, 2018
Contract with Customer, Asset, Net	$ 11.4								$ 11.4			$ 9.4
Contract with Customer, Refund Liability, Current	5.8				$ 18.4				$ 5.8	$ 18.4
Revenue, Performance Obligation, Description of Payment Terms									from 30 to 90 days
Contract with Customer, Liability, Current	13.4				12.1				$ 13.4	12.1
Contract with Customer, Liability, Noncurrent	17.3				21.9				17.3	21.9
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
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	7 years								7 years
Capitalized contract costs, amortization period									7 years
Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years								3 years
Capitalized contract costs, amortization period									3 years
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Asset, Net	$ 29.4				18.2				$ 29.4	18.2
Other non-current assets
Contract with Customer, Asset, Net	$ 187.4				$ 180.4				187.4	180.4
Europe [Member]
Net sales									4,021.9	3,735.5	3,470.1
Other
Net sales									475.9	425.9	393.1
Consolidated Entities [Member]
Net sales									10,529.6	9,799.3	9,071.0
Consolidated Entities [Member] | Europe [Member]
Net sales									4,021.9	3,735.5	3,470.1
Consolidated Entities [Member] | North America [Member]
Net sales									3,371.9	3,200.2	3,044.3
Consolidated Entities [Member] | Asia [Member]
Net sales									2,982.7	2,730.5	2,460.7
Consolidated Entities [Member] | Other
Net sales									153.1	133.1	95.9
Drivetrain [Member]
Net sales									4,139.4	3,790.3	3,523.7
Drivetrain [Member] | Europe [Member]
Net sales									947.8	952.4	848.1
Drivetrain [Member] | North America [Member]
Net sales									1,798.6	1,691.2	1,745.0
Drivetrain [Member] | Asia [Member]
Net sales									1,361.9	1,116.0	909.4
Drivetrain [Member] | Other
Net sales									31.4	30.7	21.2
Engine [Member]
Net sales									6,447.4	6,061.5	5,590.1
Engine [Member] | Europe [Member]
Net sales									3,074.1	2,783.1	2,622.0
Engine [Member] | North America [Member]
Net sales									1,573.3	1,509.0	1,299.3
Engine [Member] | Asia [Member]
Net sales									1,620.8	1,614.5	1,551.3
Engine [Member] | Other
Net sales									121.7	102.4	74.7
Reportable Geographical Components [Member] | Drivetrain [Member]
Net sales									4,139.7	3,790.3	3,523.7
Reportable Geographical Components [Member] | Engine [Member]
Net sales									$ 6,389.9	$ 6,009.0	$ 5,547.3