Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Sales Revenue, Goods, Net	$ 2,784.3	$ 2,407.0
Contract with Customer, Liability, Current	12.1		$ 12.1
Contract with Customer, Liability, Noncurrent	21.1		21.9
Contract with Customer, Refund Liability, Current	22.0		18.5
Contract with Customer, Asset, Net	9.7		9.4
Engine [Member]
Sales Revenue, Goods, Net	1,716.1	1,495.4
Drivetrain [Member]
Sales Revenue, Goods, Net	1,082.9	924.9
Europe [Member] | Consolidated Entities [Member]
Sales Revenue, Goods, Net	1,137.4	916.0
Europe [Member] | Engine [Member]
Sales Revenue, Goods, Net	846.2	679.1
Europe [Member] | Drivetrain [Member]
Sales Revenue, Goods, Net	291.2	236.9
Asia [Member] | Consolidated Entities [Member]
Sales Revenue, Goods, Net	758.4	643.9
Asia [Member] | Engine [Member]
Sales Revenue, Goods, Net	421.7	391.9
Asia [Member] | Drivetrain [Member]
Sales Revenue, Goods, Net	336.7	252.0
Other Foreign [Member] | Consolidated Entities [Member]
Sales Revenue, Goods, Net	38.8	28.2
Other Foreign [Member] | Engine [Member]
Sales Revenue, Goods, Net	31.6	21.5
Other Foreign [Member] | Drivetrain [Member]
Sales Revenue, Goods, Net	7.2	6.7
All Countries [Domain] | Consolidated Entities [Member]
Sales Revenue, Goods, Net	2,784.3	2,407.0
All Countries [Domain] | Engine [Member]
Sales Revenue, Goods, Net	1,701.2	1,482.1
All Countries [Domain] | Drivetrain [Member]
Sales Revenue, Goods, Net	1,083.1	924.9
North America [Member] | Consolidated Entities [Member]
Sales Revenue, Goods, Net	849.7	818.9
North America [Member] | Engine [Member]
Sales Revenue, Goods, Net	401.7	389.6
North America [Member] | Drivetrain [Member]
Sales Revenue, Goods, Net	448.0	$ 429.3
Prepaid Expenses and Other Current Assets [Member]
Contract with Customer, Asset, Net	21.2		18.2
Other Noncurrent Assets [Member]
Contract with Customer, Asset, Net	$ 185.5		$ 180.4
Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 years
Capitalized contract costs, amortization period	3 years
Revenue, Performance Obligation, Description of Payment Terms	30
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	7 years
Capitalized contract costs, amortization period	7 years
Revenue, Performance Obligation, Description of Payment Terms	90