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Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2016
--- | --- | --- | ---
Disclosure of detailed information about business combination [line items] |  |  |
Goodwill | $ 23.2 | $ 23.2 |
Karel |  |  |
Disclosure of detailed information about business combination [line items] |  |  |
Current assets, net of cash acquired |  | 11.5 |
Property, plant and equipment and other long-term assets |  | 1.2 |
Goodwill | $ 3.7 | 3.7 | $ 3.7
Current liabilities |  | (1.0) |
Deferred income taxes and other-long-term liabilities |  | (0.5) |
Identifiable assets acquired (liabilities assumed) |  | $ 14.9 |

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