Income Taxes Income Taxes - Operating Loss Carryforwards (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Net operating loss and capital loss carryforwards	$ 71.5	$ 81.8
State Operating Loss Carryforwards	817.8
Deferred tax liability, unremitted foreign earnings	38.5
Undistributed Earnings of Foreign Subsidiaries	3,900.0
U.S. Federal
Operating Loss Carryforwards [Line Items]
Foreign tax credit carryforwards	139.5
Non-U.S. Tax Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	134.7
Operating Loss Carryforwards subject to expiration	96.6
Operating Loss Carryforwards not subject to expiration	38.1
Operating Loss Carryforwards valuation allowance	72.9
Net operating loss and capital loss carryforwards	134.7
Non-U.S. income tax holidays	25.5	$ 21.2
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards valuation allowance	632.3
Deferred Tax Assets, Tax Credit Carryforwards, Other	14.8
Tax Credit Carryforward, Valuation Allowance	14.8
Remy International Inc. [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	68.4
Foreign tax credit carryforwards	93.6
Research and development credit	6.9
Tax Credit Carryforward, Amount	47.0
Net U.S. Cash Tax Liability	$ 8.4