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Retirement Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Plans |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Plan contributions | $ 0.1 | $ 0.1 | $ 0.2 | $ 0.2
Postretirement Medical Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |  |
Plan contributions | $ 0.2 | $ 0.3 | $ 0.4 | $ 0.6

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