Income Taxes (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
Income Tax Information [Line Items]
Foreign tax credit carryforward associated with legal restructuring	$ 108.1								$ 108.1
Net U.S. cash tax liability	8.6								8.6
Earnings before income taxes and the provision for income taxes
Earnings before income taxes - U.S.									125.6	$ 218.8	$ 136.2
Earnings before income taxes - Non-U.S.									801.2	761.3	733.1
Earnings before income taxes and noncontrolling interest	196.6	$ 232.8	$ 237.6	$ 259.8	$ 214.7	$ 244.9	$ 285.2	$ 235.3	926.8	980.1	869.3
Current:
Federal									32.5	25.7	27.7
State									(4.3)	3.9	2.6
Foreign									228.3	220.8	211.1
Total current									256.5	250.4	241.4
Deferred:
Federal									31.8	66.2	(2.3)
State									2.6	(1.2)	(7.3)
Foreign									(10.5)	(22.8)	(13.5)
Total deferred									23.9	42.2	(23.1)
Provision for income taxes	$ 61.2	$ 66.9	$ 80.2	$ 72.1	$ 67.3	$ 71.9	$ 85.3	$ 68.1	$ 280.4	$ 292.6	$ 218.3
Effective tax rate									30.30%	29.90%	25.10%
U.S. Federal
Income Tax Information [Line Items]
Foreign tax credit carryforwards									$ 142.6
Remy International Inc. [Member] | U.S. Federal
Income Tax Information [Line Items]
Foreign tax credit carryforwards									$ 26.0