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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, 2017 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 increase in discount rate | $ (0.1)
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, 2017 |
One-percentage-point increase in discount rate | (1.1)
One-percentage-point decrease in discount rate | 1.2
Retiree Plans |
Impact of one-percentage-point increase and a one-percentage-point decrease in the discount rate on retirement obligation as of December 31, 2017 |
One-percentage-point increase in discount rate | (0.2)
One-percentage-point decrease in discount rate | 0.3
United Kingdom defined benefit 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 | (1.7)
One-percentage-point increase in discount rate | 0.5
One-percentage-point decrease in expected long-term rate of return | 1.7
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, 2017 |
One-percentage-point increase in discount rate | (22.3)
One-percentage-point decrease in discount rate | $ 28.5

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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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