Recent Transactions (Details) $ / shares in Units, € in Millions, ₨ in Millions, $ in Millions				3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 29, 2015 USD ($)	Jan. 29, 2015 INR (₨)	Feb. 28, 2014 USD ($)	Sep. 30, 2015 USD ($) number_of_countries	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) number_of_countries	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) employee	Dec. 31, 2014 EUR (€)	Jul. 13, 2015 USD ($) $ / shares
Business Acquisition [Line Items]
Sales Revenue, Goods, Net				$ 1,884.0	$ 2,032.1	$ 5,900.1	$ 6,313.2
Liabilities assumed from business acquired						0.0	3.2
Debt assumed from business acquired						0.0	40.3
Aggregated estimated fair value of assets acquired and liabilities assumed
Goodwill				$ 1,183.7		1,183.7		$ 1,205.7
Cash paid, net of cash acquired						12.6	106.4
Gain on previously held equity interest						$ 10.8
Remy International Inc.
Business Acquisition [Line Items]
Business acquisition, share price | $ / shares										$ 29.50
Business combination, implied enterprise value										$ 1,200.0
Number of countries in which entity operates | number_of_countries				10		10
Entity number of employees | employee								6,600
Sales Revenue, Goods, Net								$ 1,200.0
BERU Diesel Start Systems Pvt. Ltd.
Business Acquisition [Line Items]
Equity interest acquired	51.00%
Equity interest acquired, step acquisition	100.00%
Aggregated estimated fair value of assets acquired and liabilities assumed
Cash paid, net of cash acquired	$ 12.6	₨ 783.1
Gain on previously held equity interest				$ 0.0	$ 0.0	$ 10.8	$ 0.0
Assets acquired	16.0
Definite-lived intangible assets	11.2
Assumed liabilities	4.6
Nondeductible amount of goodwill	$ 13.9
Gustav Wahler GmbH u. Co. KG and its general partner
Business Acquisition [Line Items]
Equity interest acquired			100.00%
Liabilities assumed from business acquired			$ 3.2
Debt assumed from business acquired			40.3
Aggregated estimated fair value of assets acquired and liabilities assumed
Receivables, net			52.4
Inventories, net			46.8
Property, plant and equipment, net			55.3
Goodwill			74.6
Other intangible assets, net of tax			42.7
Other assets and liabilities			(47.4)
Accounts payable and accrued expenses			(70.4)
Total consideration, net of cash acquired			154.0
Less: Assumed retirement-related liabilities			3.2
Less: Assumed debt			40.3
Cash paid, net of cash acquired								$ 110.5	€ 80.1
Nondeductible amount of goodwill			56.9
Gustav Wahler GmbH u. Co. KG and its general partner | Customer Relationships
Aggregated estimated fair value of assets acquired and liabilities assumed
Other intangible assets, net of tax			24.9
Gustav Wahler GmbH u. Co. KG and its general partner | Know-how
Aggregated estimated fair value of assets acquired and liabilities assumed
Other intangible assets, net of tax			10.2
Gustav Wahler GmbH u. Co. KG and its general partner | Patented technology
Aggregated estimated fair value of assets acquired and liabilities assumed
Other intangible assets, net of tax			4.1
Trade Names | Gustav Wahler GmbH u. Co. KG and its general partner
Aggregated estimated fair value of assets acquired and liabilities assumed
Other intangible assets, net of tax			$ 3.5
Minimum | Gustav Wahler GmbH u. Co. KG and its general partner
Aggregated estimated fair value of assets acquired and liabilities assumed
Weighted average useful life			5 years
Maximum | Gustav Wahler GmbH u. Co. KG and its general partner
Aggregated estimated fair value of assets acquired and liabilities assumed
Weighted average useful life			15 years