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- Net Periodic Expense (Income) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 14, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Jul. 02, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  |  |  |
Recognized pre-tax actuarial losses |  | $ 4.2 | $ 10.2 | $ 1.8 |  | $ 1.8 | $ 11.4
Amount of curtailment gain | $ 5.1 |  |  |  |  |  | 5.1
Postretirement Plans |  |  |  |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  |  |  |
Service cost |  |  |  |  | $ 0.0 | 0.0 | 0.1
Interest cost |  |  |  |  | 3.5 | 4.2 | 4.4
Amortization of unrecognized prior service credits |  |  |  |  | (1.7) | (0.8) | (0.8)
Settlements |  |  |  |  | (2.6) | 0.0 | (1.8)
Recognized net actuarial (gains) losses |  |  |  |  | (2.8) | 0.6 | (4.0)
Total net periodic pension benefit expense |  |  |  |  | $ (3.6) | $ 4.0 | $ (2.1)
Weighted-average actuarial assumptions used in determining net periodic pension expense: |  |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  | 3.60% | 3.88% | 3.53%
Weighted-average actuarial assumptions used in determining year-end benefit obligations: |  |  |  |  |  |  |
Discount rate (as a percent) |  | 3.34% | 3.69% |  | 3.34% | 3.69% | 3.88%
Assumed health care cost trend rates: |  |  |  |  |  |  |
Heath care cost trend rate for next year (as a percent) |  | 7.25% | 7.50% |  | 7.25% | 7.50% | 6.60%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (as a percent) |  | 5.00% | 5.00% |  | 5.00% | 5.00% | 5.00%
Year that the rate reaches the ultimate trend rate |  |  |  |  | 2027 | 2027 | 2024
Effects on postretirement expense of a percentage point change in assumed health care cost trend rates |  |  |  |  |  |  |
Effect of 1% increase on total of service and interest costs |  |  |  |  | $ 1.4 |  |
Effect of 1% decrease on total of service and interest costs |  |  |  |  | 1.6 |  |
United States |  |  |  |  |  |  |
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets |  |  |  |  |  |  |
Projected benefit obligation |  | $ 357.1 | $ 348.1 |  | 357.1 | $ 348.1 |
Accumulated benefit obligation |  | 357.1 | 347.9 |  | 357.1 | 347.9 |
Fair value of plan assets |  | 269.7 | 261.9 |  | 269.7 | 261.9 |
Accumulated benefit obligation |  | $ 357.1 | $ 347.9 |  | 357.1 | 347.9 |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  |  |  |
Service cost |  |  |  |  | 0.3 | 0.4 | $ 2.5
Interest cost |  |  |  |  | 13.4 | 13.9 | 16.5
Expected return on plan assets |  |  |  |  | (10.1) | (12.9) | (18.0)
Amortization of unrecognized prior service credits |  |  |  |  | (0.1) | (0.2) | (0.1)
Recognized net actuarial (gains) losses |  |  |  |  | 3.9 | 3.2 | 18.9
Total net periodic pension benefit expense |  |  |  |  | $ 7.4 | $ 4.4 | $ 19.8
Weighted-average actuarial assumptions used in determining net periodic pension expense: |  |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  | 3.98% | 4.06% | 4.09%
Rate of increase in compensation levels (as a percent) |  |  |  |  | 3.75% | 3.75% | 3.75%
Expected long-term rate of return on assets (as a percent) |  |  |  |  | 4.00% | 5.00% | 5.75%
Weighted-average actuarial assumptions used in determining year-end benefit obligations: |  |  |  |  |  |  |
Discount rate (as a percent) |  | 3.57% | 3.98% |  | 3.57% | 3.98% | 4.24%
Rate of increase in compensation levels (as a percent) |  | 3.75% | 3.75% |  | 3.75% | 3.75% | 3.75%
Foreign Plan |  |  |  |  |  |  |
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets |  |  |  |  |  |  |
Projected benefit obligation |  | $ 0.2 | $ 43.8 |  | $ 0.2 | $ 43.8 |
Accumulated benefit obligation |  | 0.2 | 43.8 |  | 0.2 | 43.8 |
Fair value of plan assets |  | 0.0 | 43.2 |  | 0.0 | 43.2 |
Accumulated benefit obligation |  | $ 175.2 | $ 157.6 |  | 175.2 | 157.6 |
Defined Benefit Plan, Net Periodic Benefit Cost |  |  |  |  |  |  |
Service cost |  |  |  |  | 0.0 | 0.0 | $ 1.3
Interest cost |  |  |  |  | 4.9 | 5.6 | 7.7
Expected return on plan assets |  |  |  |  | (6.4) | (6.6) | (9.7)
Recognized net actuarial (gains) losses |  |  |  |  | 3.1 | 8.2 | 3.8
Total net periodic pension benefit expense |  |  |  |  | 1.6 | 7.2 | 3.1
Less: Net periodic pension expense of discontinued operations |  |  |  |  | 0.0 | (0.2) | (2.2)
Net periodic pension benefit expense of continuing operations |  |  |  |  | $ 1.6 | $ 7.0 | $ 0.9
Weighted-average actuarial assumptions used in determining net periodic pension expense: |  |  |  |  |  |  |
Discount rate (as a percent) |  |  |  |  | 2.97% | 3.82% | 3.68%
Rate of increase in compensation levels (as a percent) |  |  |  |  |  |  | 4.00%
Expected long-term rate of return on assets (as a percent) |  |  |  |  | 4.09% | 4.57% | 5.81%
Weighted-average actuarial assumptions used in determining year-end benefit obligations: |  |  |  |  |  |  |
Discount rate (as a percent) |  | 2.76% | 2.97% |  | 2.76% | 2.97% | 3.82%
Rate of increase in compensation levels (as a percent) |  |  |  |  |  |  | 4.00%

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