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v3.19.1

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

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