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Goodwill and Other Intangibles - Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |  |  |  |
Amortized intangible assets, gross |  |  |  |  | $ 649.9 | $ 674.0
Amortized intangible assets, accumulated amortization | $ 237.1 | $ 186.1 |  | $ 186.1 | 265.8 | 237.1
Amortized intangible assets, net |  |  |  |  | 384.1 | 436.9
Other intangible assets, net |  |  |  |  | 439.5 | 492.7
Amortized intangible assets, future amortization expense [Abstract] |  |  |  |  |  |
Future Amortization Expense - 2019 |  |  |  |  | 38.8 |
Future Amortization Expense - 2020 |  |  |  |  | 38.5 |
Future Amortization Expense - 2021 |  |  |  |  | 38.0 |
Future Amortization Expense - 2022 |  |  |  |  | 36.8 |
Future Amortization Expense - 2023 |  |  |  |  | 31.0 |
Intangible assets (excluding goodwill), gross [Roll Forward] |  |  |  |  |  |
Beginning balance, January 1 | 729.8 | 649.6 |  |  |  |
Acquisitions | 0.0 | 72.6 | [1] |  |  |
Held for sale | 0.0 | (32.7) |  |  |  |
Translation adjustment | (24.5) | 40.3 |  |  |  |
Ending balance, December 31 | 705.3 | 729.8 |  | 649.6 |  |
Intangible assets, accumulated amortization [Roll Forward] |  |  |  |  |  |
Beginning balance, January 1 | 237.1 | 186.1 |  |  |  |
Amortization | 40.1 | 40.0 |  | 40.4 |  |
Held for sale | 0.0 | (11.6) |  |  |  |
Translation adjustment | (11.4) | 22.6 |  |  |  |
Ending balance, December 31 | 265.8 | 237.1 |  | $ 186.1 |  |
Patented and unpatented technology [Member] |  |  |  |  |  |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |  |  |  |
Amortized intangible assets, gross |  |  |  |  | 151.9 | 157.7
Amortized intangible assets, accumulated amortization | 52.9 | 52.9 |  |  | 60.7 | 52.9
Amortized intangible assets, net |  |  |  |  | 91.2 | 104.8
Intangible assets, accumulated amortization [Roll Forward] |  |  |  |  |  |
Beginning balance, January 1 | 52.9 |  |  |  |  |
Ending balance, December 31 | 60.7 | 52.9 |  |  |  |
Customer relationships |  |  |  |  |  |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |  |  |  |
Amortized intangible assets, gross |  |  |  |  | 489.7 | 507.6
Amortized intangible assets, accumulated amortization | 181.0 | 181.0 |  |  | 201.2 | 181.0
Amortized intangible assets, net |  |  |  |  | 288.5 | 326.6
Intangible assets, accumulated amortization [Roll Forward] |  |  |  |  |  |
Beginning balance, January 1 | 181.0 |  |  |  |  |
Ending balance, December 31 | 201.2 | 181.0 |  |  |  |
Miscellaneous amortizable assets |  |  |  |  |  |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |  |  |  |
Amortized intangible assets, gross |  |  |  |  | 8.3 | 8.7
Amortized intangible assets, accumulated amortization | 3.2 | 3.2 |  |  | 3.9 | 3.2
Amortized intangible assets, net |  |  |  |  | 4.4 | 5.5
Intangible assets, accumulated amortization [Roll Forward] |  |  |  |  |  |
Beginning balance, January 1 | 3.2 |  |  |  |  |
Ending balance, December 31 | $ 3.9 | $ 3.2 |  |  |  |
Unamortized trade names |  |  |  |  |  |
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |  |  |  |  |
Unamortized trade names |  |  |  |  | $ 55.4 | $ 55.8
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.

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