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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2018
Unrecognized net actuarial losses |  | $ 380.6 | $ 404.8 | $ 336.6 |
Reduction in equity |  | $ 285.1 | 304.5 | 249.0 |
Defined benefit plan, target allocation percentage of assets, near-term benefit payments |  | 30.00% |  |  |
Defined benefit plan, target allocation percentage of assets, long-term growth |  | 70.00% |  |  |
Company contributions |  | $ 12.3 | 11.6 | 12.0 |
Alternative Investments |  |  |  |  |
Defined benefit plan, target plan asset allocations |  | 5.00% |  |  |
Equity Securities |  |  |  |  |
Defined benefit plan, target plan asset allocations |  | 40.00% |  |  |
Fixed Income Investments |  |  |  |  |
Defined benefit plan, target plan asset allocations |  | 55.00% |  |  |
Minimum |  |  |  |  |
Percentage of joint venture's unrecognized net actuarial losses and unrecognized prior service cost |  | 20.00% |  |  |
ENPP |  |  |  |  |
Minimum age for vesting |  | 50 years |  |  |
Minimum participation period to qualify for payment |  | 10 years |  |  |
Minimum service period to vest |  | 5 years |  |  |
Minimum age to receive benefits |  | 65 years |  |  |
Period over which retirement benefits are paid |  | 15 years |  |  |
Period considered when determining retirement benefits |  | 3 years |  |  |
Minimum service period |  | 20 years |  |  |
Final years of service |  | 10 years |  |  |
Pension and Other Postretirement Benefit Plans [Member] |  |  |  |  |
Aggregate projected benefit obligation |  | $ 946.0 | 877.6 |  |
Accumulated benefit obligation |  | 891.2 | 823.8 |  |
Fair value of plan assets |  | 690.8 | 600.9 |  |
Reduction in equity |  | 379.3 | 403.5 |  |
Tax effect of benefit plans |  | $ 95.0 | $ 99.8 |  |
Pension Benefits |  |  |  |  |
Percentage of fixed income securities consisting of high-yield securities |  | 13.00% | 13.00% |  |
Percentage of Fixed Income Securities Consisting of Foreign Securities |  | 15.00% | 31.00% |  |
Unrecognized net actuarial losses |  | $ 360.1 | $ 384.7 |  |
Net prior service (credit) cost |  | 12.2 | 13.4 |  |
Net loss recognized due to settlement |  | $ 0.2 | $ 0.4 | $ 0.2 |
Weighted average discount rate |  | 2.50% | 2.70% |  |
Benefit payments in 2018 (less than) |  | $ 47.6 |  |  |
Benefit payments made to defined benefit pension plans and ENPP |  | 43.3 |  |  |
Benefits paid |  | $ 42.6 | $ 44.1 |  |
Weighted average expected long-term rate of return on plan assets |  | 5.80% | 6.80% | 6.80% |
Pension Benefits | Forecast |  |  |  |  |
Net actuarial (gain) loss that will be amortized from accumulated other comprehensive loss |  |  |  |  | $ 12.2
Net prior service (credit) cost that will be amortized from accumulated other comprehensive loss |  |  |  |  | $ (1.2)
Postretirement Benefits |  |  |  |  |
Unrecognized net actuarial losses |  | $ 3.8 | $ 2.0 |  |
Net prior service (credit) cost |  | 3.2 | $ 3.4 |  |
Net actuarial (gain) loss that will be amortized from accumulated other comprehensive loss |  | 0.1 |  |  |
Net prior service (credit) cost that will be amortized from accumulated other comprehensive loss |  | $ (0.2) |  |  |
Weighted average discount rate |  | 4.90% | 5.30% |  |
Benefit payments in 2018 (less than) |  | $ 1.6 |  |  |
Benefits paid |  | $ 1.6 | $ 1.2 |  |
Brazilian Postretirement Benefit Obligation, Defined Benefit [Member] |  |  |  |  |
Health care cost trend rate assumed |  | 11.00% | 11.80% |  |
Ultimate health care cost trend rate |  | 5.30% | 6.10% |  |
Benefit payments in 2018 (less than) |  | $ 0.1 |  |  |
U.S Based Postretirement Health Care and Life Insurance Benefit Plans |  |  |  |  |
Health care cost trend rate assumed |  | 6.75% | 7.00% |  |
Ultimate health care cost trend rate |  | 5.00% | 5.00% |  |
Benefit payments in 2018 (less than) |  | $ 1.6 |  |  |
UNITED STATES | Pension Benefits |  |  |  |  |
Aggregate projected benefit obligation |  | 129.6 | $ 118.1 |  |
Accumulated benefit obligation |  | 111.5 | 101.9 |  |
Fair value of plan assets |  | $ 36.6 | $ 36.2 |  |
Weighted average discount rate |  | 3.70% | 4.25% |  |
Expected minimum contribution |  | $ 3.1 |  |  |
Defined benefit plan, target allocation percentage of assets, near-term benefit payments |  | 15.00% |  |  |
Defined benefit plan, target allocation percentage of assets, long-term growth |  | 85.00% |  |  |
Defined benefit plan, assumptions used in investment strategy, expected return next fiscal year |  | 6.40% |  |  |
Weighted average expected long-term rate of return on plan assets | [1] | 6.00% | 6.00% | 6.00% |
UNITED STATES | Pension Benefits | Large and small cap domestic equity securities |  |  |  |  |
Defined benefit plan, target plan asset allocations |  | 30.00% |  |  |
UNITED STATES | Pension Benefits | International equity securities |  |  |  |  |
Defined benefit plan, target plan asset allocations |  | 12.00% |  |  |
UNITED STATES | Pension Benefits | Fixed Income Securities |  |  |  |  |
Defined benefit plan, target plan asset allocations |  | 44.00% |  |  |
UNITED STATES | Pension Benefits | Alternative Investments |  |  |  |  |
Defined benefit plan, target plan asset allocations |  | 14.00% |  |  |
Foreign Plan [Member] | U.K. Pension Plans, Defined Benefit |  |  |  |  |
Expected minimum contribution |  | $ 20.6 |  |  |
Weighted average expected long-term rate of return on plan assets |  | 5.50% |  |  |
Foreign Plan [Member] | Pension Benefits |  |  |  |  |
Expected minimum contribution |  | $ 29.8 |  |  |
Defined benefit plan, historical average return on asset mix |  | 6.00% |  |  |
Corporate Joint Venture | GIMA |  |  |  |  |
Reduction in equity |  | $ (1.3) | $ (1.3) |  |
Tax effect of benefit plans |  | $ 0.5 | $ 0.5 |  |
Percentage of joint venture's unrecognized net actuarial losses and unrecognized prior service cost |  | 50.00% | 50.00% |  |
Net loss recognized due to settlement |  | $ 0.1 | $ 0.1 |  |
[1] | Applicable for U.S. funded, qualified plans.

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