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v3.20.2

Retirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Plan contributions | $ 0.1 | $ 0.1 | $ 0.2 | $ 0.3
Postretirement Medical Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Plan contributions | $ 0.1 | $ 0.3 | $ 0.4 | $ 0.7

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