Goodwill and Other Intangibles - Intangible Assets (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortized intangible assets, gross							$ 670.2	$ 594.8
Amortized intangible assets, accumulated amortization		$ 186.1		$ 161.5		$ 161.5	237.1	186.1
Amortized intangible assets, net							433.1	408.7
Other intangible assets, net							492.7	463.5
Amortized intangible assets, future amortization expense [Abstract]
Future Amortization Expense - 2018							44.3
Future Amortization Expense - 2019							43.3
Future Amortization Expense - 2020							42.5
Future Amortization Expense - 2021							42.2
Future Amortization Expense - 2022							40.9
Intangible assets (excluding goodwill), gross [Roll Forward]
Beginning balance, January 1		649.6		705.3
Acquisitions		72.6	[1]	0.0
Held for sale		(32.7)		0.0
Impairment		0.0		(23.9)	[2]
Divestitures	[3]			(19.9)
Translation adjustment		40.3		(11.9)
Ending balance, December 31		729.8		649.6		705.3
Intangible assets, accumulated amortization [Roll Forward]
Beginning balance, January 1		186.1		161.5
Amortization		40.0		40.4		19.2
Held for sale		11.6		0.0
Impairment		0.0		(8.2)
Divestitures		0.0		(0.3)
Translation adjustment		22.6		(7.3)
Ending balance, December 31		237.1		186.1		$ 161.5
Patented and unpatented technology [Member]
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortized intangible assets, gross							157.7	108.1
Amortized intangible assets, accumulated amortization		41.5		41.5			52.9	41.5
Amortized intangible assets, net							104.8	66.6
Intangible assets, accumulated amortization [Roll Forward]
Beginning balance, January 1		41.5
Ending balance, December 31		52.9		41.5
Customer relationships
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortized intangible assets, gross							507.6	481.4
Amortized intangible assets, accumulated amortization		141.2		141.2			181.0	141.2
Amortized intangible assets, net							326.6	340.2
Intangible assets, accumulated amortization [Roll Forward]
Beginning balance, January 1		141.2
Ending balance, December 31		181.0		141.2
Miscellaneous amortizable assets
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Amortized intangible assets, gross							4.9	5.3
Amortized intangible assets, accumulated amortization		3.4		3.4			3.2	3.4
Amortized intangible assets, net							1.7	1.9
Intangible assets, accumulated amortization [Roll Forward]
Beginning balance, January 1		3.4
Ending balance, December 31		$ 3.2		$ 3.4
In-process research and development
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Indefinite-lived intangible assets (excluding goodwill)							3.8	3.8
Unamortized trade names
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Unamortized trade names							$ 55.8	$ 51.0
Minimum [Member]
Amortized intangible assets, future amortization expense [Abstract]
Amortized intangible assets, useful life		3 years
Maximum [Member]
Amortized intangible assets, future amortization expense [Abstract]
Amortized intangible assets, useful life		20 years

[1] *Acquisitions primarily relate to the Company's 2017 purchase of Sevcon.

[2] ** Relates to the impairment of the Company's Etatech ECCOS intellectual technology in 2016.

[3] *** Divestiture relates to the Company's sale of Remy light vehicle aftermarket business in 2016.