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Acquisitions - Purchase Price Allocation (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2018
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Goodwill |  |  | $ 198.6 | $ 198.3 | $ 198.4 |
Atrenne |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Current assets, net of cash acquired | $ 31.5 |  |  |  |  |
Property, plant and equipment and other long-term assets | 7.8 |  |  |  |  |
Customer intangible assets and computer software assets | 51.0 |  |  |  |  |
Goodwill | 62.6 |  |  |  |  |
Current liabilities | (8.5) |  |  |  |  |
Deferred income taxes and other-long-term liabilities | (4.1) |  |  |  |  |
Identifiable net assets acquired | 140.3 |  |  |  |  |
Cash acquired | 1.1 |  |  |  |  |
Inventory fair value adjustment | $ 1.6 | $ 1.6 |  |  |  |
Impakt |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |
Current assets, net of cash acquired |  |  |  |  |  | $ 49.2
Property, plant and equipment and other long-term assets |  |  |  |  |  | 20.6
Customer intangible assets and computer software assets |  |  |  |  |  | 219.3
Goodwill |  |  | $ 112.8 |  |  | 112.6
Current liabilities |  |  |  |  |  | (25.8)
Deferred income taxes and other-long-term liabilities |  |  |  |  |  | (51.8)
Identifiable net assets acquired |  |  |  |  |  | 324.1
Cash acquired |  |  |  |  |  | $ 5.9

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