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Goodwill and Intangible Assets - Intangible Assets by Major Class (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Intangible Assets by Major Class [Line Items] |  |
Cost | $ 83.2 | $ 78.1
Accumulated Amortization | (52.7) | (48.3)
Net | 30.5 | 29.8
Patents and licensing |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |
Cost | 25.9 | 21.5
Accumulated Amortization | (17.9) | (16.0)
Net | 8.0 | 5.5
Technology |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |
Cost | 3.3 | 3.3
Accumulated Amortization | (1.7) | (1.5)
Net | 1.6 | 1.8
Trademarks |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |
Cost | 2.0 | 2.0
Accumulated Amortization | (1.8) | (1.8)
Net | 0.2 | 0.2
Customer relationships |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |
Cost | 40.9 | 40.3
Accumulated Amortization | (23.4) | (21.6)
Net | 17.5 | 18.7
Customer contracts |  |
Schedule of Intangible Assets by Major Class [Line Items] |  |
Cost | 11.1 | 11.0
Accumulated Amortization | (7.9) | (7.4)
Net | $ 3.2 | $ 3.6

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