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Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Nov. 30, 2018 | Apr. 30, 2018 | Dec. 31, 2017 | [1] | Jan. 01, 2017 | [1]
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Disclosure of detailed information about business combination [line items] |  |  |  |  |
Goodwill | $ 198.4 |  |  | $ 23.2 | $ 23.2
Atrenne |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Cash acquired |  |  | $ 1.1 |  |
Current assets, net of cash acquired |  |  | 31.5 |  |
Property, plant and equipment |  |  | 7.8 |  |
Customer intangible assets and computer software assets |  |  | 51.0 |  |
Goodwill |  |  | 64.0 |  |
Current liabilities |  |  | (8.5) |  |
Deferred income taxes and other-long-term liabilities |  |  | (4.1) |  |
Identifiable assets acquired (liabilities assumed) |  |  | $ 141.7 |  |
Impakt |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Cash acquired |  | $ 5.9 |  |  |
Current assets, net of cash acquired |  | 46.7 |  |  |
Property, plant and equipment |  | 20.9 |  |  |
Customer intangible assets and computer software assets |  | 223.0 |  |  |
Goodwill |  | 111.2 |  |  |
Current liabilities |  | (23.8) |  |  |
Deferred income taxes and other-long-term liabilities |  | (52.6) |  |  |
Identifiable assets acquired (liabilities assumed) |  | $ 325.4 |  |  |
[1] | Certain prior period figures have been restated to reflect the adoption of IFRS 15 (see note 2)

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