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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, 2014
Unrecognized net actuarial losses   $ 404.8 $ 336.6 $ 341.5
Reduction in equity   $ 304.5 249.0 253.3
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   $ 11.6 12.0 13.3
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%    
Pension and Other Postretirement Benefit Plans [Member]        
Unrecognized net actuarial losses   $ 403.5 335.2  
Aggregate projected benefit obligation   877.6 869.2  
Accumulated benefit obligation   823.8 816.9  
Fair value of plan assets   600.9 627.9  
Tax effect of benefit plans   99.8 87.1  
Pension Benefits        
Unrecognized net actuarial losses   384.7 319.0  
Net prior service (credit) cost   13.4 11.2  
Net loss recognized due to settlement   $ 0.4 $ 0.2 $ 0.4 [1]
Weighted average discount rate   2.70% 3.60%  
Benefit payments in 2017 (less than)   $ 41.9    
Benefit payments made to defined benefit pension plans and ENPP   47.9    
Benefit payments made   $ 44.1 $ 50.8  
Weighted average expected long-term rate of return on plan assets   6.80% 6.80% 6.90%
Pension Benefits | Forecast        
Net actuarial (gain) loss that will be amortized from accumulated other comprehensive loss $ 12.0      
Net prior service (credit) cost that will be amortized from accumulated other comprehensive loss $ (1.2)      
U.S. Based Pension Benefit Plans        
Aggregate projected benefit obligation   $ 118.1 $ 112.2  
Accumulated benefit obligation   101.9 98.4  
Fair value of plan assets   $ 36.2 $ 38.1  
Weighted average discount rate   4.25% 4.60%  
Expected minimum contribution   $ 2.2    
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   6.70%    
Weighted average expected long-term rate of return on plan assets [2]   6.00% 6.00% 7.00%
U.S. Based Pension Benefit Plans | Large and small cap domestic equity securities        
Defined benefit plan, target plan asset allocations   30.00%    
U.S. Based Pension Benefit Plans | International equity securities        
Defined benefit plan, target plan asset allocations   12.00%    
U.S. Based Pension Benefit Plans | Fixed Income Securities        
Defined benefit plan, target plan asset allocations   44.00%    
U.S. Based Pension Benefit Plans | Alternative Investments        
Defined benefit plan, target plan asset allocations   14.00%    
Non-U.S. Pension Benefit Plans        
Expected minimum contribution   $ 26.6    
Defined benefit plan, historical average return on asset mix   6.30%    
U.K. Pension Plans, Defined Benefit        
Expected minimum contribution   $ 19.0    
Weighted average expected long-term rate of return on plan assets   6.00%    
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    
Postretirement Benefits        
Unrecognized net actuarial losses   $ 2.0 $ 1.4  
Net prior service (credit) cost   3.4 $ 3.6  
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   5.30% 5.10%  
Benefit payments in 2017 (less than)   $ 1.6    
Benefit payments made   $ 1.2 $ 1.2  
Brazilian Postretirement Benefit Obligation, Defined Benefit        
Health care cost trend rate assumed   11.80% 12.60%  
Ultimate health care cost trend rate   6.10% 6.80%  
Benefit payments in 2017 (less than)   $ 0.1    
U.S Based Postretirement Health Care and Life Insurance Benefit Plans        
Health care cost trend rate assumed   7.00% 7.25%  
Ultimate health care cost trend rate   5.00%    
Benefit payments in 2017 (less than)   $ 1.5    
Minimum        
Percentage of joint venture's unrecognized net actuarial losses and unrecognized prior service cost   20.00%    
GIMA | Corporate Joint Venture        
Unrecognized net actuarial losses     $ 1.4  
Reduction in equity   $ 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] Rounding may impact summation of amounts.
[2] Applicable for U.S. funded, qualified plans.