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Retirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Pension Plans |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Plan contributions | $ 0.1 | $ 0.1
Postretirement Medical Benefits |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |
Plan contributions | $ 0.2 | $ 0.2

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