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Goodwill and Other Intangibles - Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Changes in the carrying amount of goodwill |  |  |  |
Net goodwill balance, January 1 | $ 1,881.8 |  |  |
Ending balance, December 31 | $ 1,853.4 |  | $ 1,881.8 |
Goodwill impairment test, weighted average cost of capital discount rate for future cash flow | 10.90% |  |  |
Sensitivity analysis Increase in discount rate | 1.00% |  |  |
Sensitivity analysis decrease in operating margin assumption | 1.00% |  |  |
Sensitivity analysis decrease in revenue growth rate | 1.00% |  |  |
Engine [Member] |  |  |  |
Changes in the carrying amount of goodwill |  |  |  |
Gross goodwill balance, January 1 | $ 1,359.6 |  | 1,324.0 |
Accumulated impairment losses, January 1 |  |  | (501.8) | $ (501.8)
Net goodwill balance, January 1 | 857.8 |  | 822.2 |
Acquisitions | 0.0 |  | 0.0 |
Held for sale | 0.0 |  | (7.3) |
Translation adjustment and other | (16.5) |  | 42.9 |
Ending balance, December 31 | 841.3 |  | 857.8 |
Drivetrain [Member] |  |  |  |
Changes in the carrying amount of goodwill |  |  |  |
Gross goodwill balance, January 1 | 1,024.2 |  | 880.2 |
Accumulated impairment losses, January 1 |  |  | (0.2) | $ (0.2)
Net goodwill balance, January 1 | 1,024.0 |  | 880.0 |
Acquisitions | 1.7 | [1] | 125.8 |
Held for sale | 0.0 |  | 0.0 |
Translation adjustment and other | (13.6) |  | 18.2 |
Ending balance, December 31 | $ 1,012.1 |  | $ 1,024.0 |
[1] | *Acquisitions relate to the Company's 2017 purchase of Sevcon.

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