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Employee Benefit Plans - Summary of the Sensitivity of Retirement Obligations and Retirement Benefit Costs of Plans to Changes in the Key Assumptions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Pension Plans |
Estimated increase (decrease) in 2020 pension cost |
0.50% increase in discount rate | $ (0.8)
0.50% decrease in discount rate | 0.9
0.50% increase in long-term return on assets | (0.7)
0.50% decrease in long-term return on assets | 0.7
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2019 |
0.50% increase in discount rate | (14.3)
0.50% decrease in discount rate | 15.7
Postretirement Medical and Other |
Estimated increase (decrease) in 2020 pension cost |
0.50% decrease in discount rate | (0.1)
1% decrease in medical trend rates | (0.1)
Estimated increase (decrease) in Projected Benefit Obligation for the year ended December 31, 2019 |
0.50% increase in discount rate | (0.6)
0.50% decrease in discount rate | 0.6
1% increase in medical trend rates | 0.7
1% decrease in medical trend rates | $ (0.6)

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