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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Weighted-Average Interest Crediting Rate 1.00% 0.75%  
Unrecognized net actuarial losses (gains) $ 379.8 $ 380.6 $ 404.8
Reduction in equity $ 282.4 285.1 304.5
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%    
Weighted average expected long-term rate of return on plan assets 5.50%    
Company contributions $ 15.8 $ 15.1 14.3
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%    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 1.75% 1.75%  
Maximum      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase 5.00% 5.00%  
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    
Defined Benefit Plan, Amortization Period 8 years    
Pension and Other Postretirement Benefit Plans [Member]      
Aggregate projected benefit obligation $ 847.3 $ 946.0  
Accumulated benefit obligation 798.5 891.2  
Fair value of plan assets 616.0 690.8  
Reduction in equity 378.7 379.3  
Tax effect of benefit plans $ 97.0 $ 95.0  
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 17.00% 15.00%  
Unrecognized net actuarial losses (gains) $ 356.7 $ 360.1  
Unrecognized prior service cost 19.5 12.2  
Net loss recognized due to settlement $ 0.9 $ 0.2 $ 0.4
Weighted average discount rate 2.80% 2.50%  
Benefit payments in 2018 (less than) $ 46.4    
Benefit payments made to defined benefit pension plans and ENPP 47.4    
Benefits paid $ 45.9 $ 42.6  
Weighted average expected long-term rate of return on plan assets 5.40% 5.80% 6.80%
Postretirement Benefits      
Unrecognized net actuarial losses (gains) $ (0.6) $ 3.8  
Defined Benefit Plan, Amortization Period 12 years    
Unrecognized prior service cost $ 3.1 $ 3.2  
Weighted average discount rate 5.20% 4.90%  
Benefit payments in 2018 (less than) $ 1.5    
Benefits paid $ 1.4 $ 1.6  
Brazilian Postretirement Benefit Obligation, Defined Benefit [Member]      
Health care cost trend rate assumed 10.80% 11.00%  
Ultimate health care cost trend rate 5.00% 5.30%  
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 6.50% 6.75%  
Ultimate health care cost trend rate 5.00% 5.00%  
Benefit payments in 2018 (less than) $ 1.5    
UNITED STATES | Pension Benefits      
Defined Benefit Plan, Amortization Period 16 years    
Aggregate projected benefit obligation $ 124.7 $ 129.6  
Accumulated benefit obligation 107.8 111.5  
Fair value of plan assets $ 36.8 $ 36.6  
Weighted average discount rate 4.35% 3.70%  
Expected minimum contribution $ 1.6    
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 5.75%    
Weighted average expected long-term rate of return on plan assets [1] 6.00% 6.00% 6.00%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase [2] 5.00% 5.00%  
UNITED STATES | Pension Benefits | Large and small cap domestic equity securities      
Defined benefit plan, target plan asset allocations 21.50%    
UNITED STATES | Pension Benefits | International equity securities      
Defined benefit plan, target plan asset allocations 8.50%    
UNITED STATES | Pension Benefits | Fixed Income Securities      
Defined benefit plan, target plan asset allocations 55.00%    
UNITED STATES | Pension Benefits | Alternative Investments      
Defined benefit plan, target plan asset allocations 10.00%    
UNITED STATES | Pension Benefits | Defined Benefit Plan, Cash [Member]      
Defined benefit plan, target plan asset allocations 5.00%    
UNITED STATES | Postretirement Benefits      
Unrecognized net actuarial losses (gains) $ 0.3    
Foreign Plan [Member] | U.K. Pension Plans, Defined Benefit      
Expected minimum contribution $ 19.9    
Weighted average expected long-term rate of return on plan assets 4.75%    
Foreign Plan [Member] | Pension Benefits      
Defined Benefit Plan, Amortization Period 19 years    
Expected minimum contribution $ 28.9    
Defined benefit plan, historical average return on asset mix 5.20%    
Corporate Joint Venture | GIMA      
Reduction in equity $ (1.1) $ (1.3)  
Tax effect of benefit plans $ 0.4 $ 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  
BRAZIL | Postretirement Benefits      
Defined Benefit Plan, Accumulated Benefit Obligation $ 0.6    
[1] Applicable for U.S. funded, qualified plans.
[2] Applicable for U.S. unfunded, nonqualified plan.