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Retirement and Other Postretirement Benefit Plans - Schedule of Impact of One-Percentage-Point Change in Expected Long-term Rate of Return and Discount Rate on Pension Expense and Retirement Obligation (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
U.S. Non-qualified Defined Benefit Retirement Plans |
Impact of one-percentage-point increase and a one-percentage-point decrease in the expected long-term rate of return and discount rate on periodic pension expense in next fiscal year |
One-percentage-point decrease in discount rate | $ 0.1
Impact of one-percentage-point increase and a one-percentage-point decrease in the discount rate on retirement obligation as of December 31, 2019 |
One-percentage-point increase in discount rate | (0.8)
One-percentage-point decrease in discount rate | 0.9
U.S. Retiree Medical Plans |
Impact of one-percentage-point increase and a one-percentage-point decrease in the discount rate on retirement obligation as of December 31, 2019 |
One-percentage-point increase in discount rate | (0.1)
One-percentage-point decrease in discount rate | 0.1
United Kingdom defined benefit Retirement plan (the U.K. Plan) |
Impact of one-percentage-point increase and a one-percentage-point decrease in the expected long-term rate of return and discount rate on periodic pension expense in next fiscal year |
One-percentage-point increase in expected long-term rate of return | (1.4)
One-percentage-point increase in discount rate | (0.3)
One-percentage-point decrease in expected long-term rate of return | 1.4
One-percentage-point decrease in discount rate | 0.2
Impact of one-percentage-point increase and a one-percentage-point decrease in the discount rate on retirement obligation as of December 31, 2019 |
One-percentage-point increase in discount rate | (21.6)
One-percentage-point decrease in discount rate | $ 29.0

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- Definition Represents the impact of one-percentage-point decrease in the discount rate on retirement obligations at the end of next fiscal year. + References No definition available. + Details
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- Definition Represents the impact of one-percentage-point decrease in the discount rate on periodic pension expenses in the next fiscal year. + References No definition available. + Details
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- Definition Represents the impact of one-percentage-point decrease in the expected long-term rate of return on periodic pension expenses in the next fiscal year. + References No definition available. + Details
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- Definition Defined benefit plan effect of one percentage point increase in discount rate on net periodic benefit cost increase decrease in next fiscal year. + References No definition available. + Details
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