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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.

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