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Employee Benefit Plans (Assumptions for Benefit Obligation) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax $ (379.8) $ (380.6) $ (404.8)
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax (356.7) (360.1)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax $ 19.5 $ 12.2  
Weighted average discount rate 2.80% 2.50%  
Other Postretirement Benefits Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax $ 0.6 $ (3.8)  
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax $ 3.1 $ 3.2  
Weighted average discount rate 5.20% 4.90%  
Minimum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Rate of increase in future compensation 1.75% 1.75%  
Maximum      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Rate of increase in future compensation 5.00% 5.00%  
UNITED STATES | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Weighted average discount rate 4.35% 3.70%  
Rate of increase in future compensation [1] 5.00% 5.00%  
UNITED STATES | Other Postretirement Benefits Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax $ (0.3)    
AOCI Attributable to Noncontrolling Interest | UNITED STATES | Other Postretirement Benefits Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax   $ (3.4)  
[1] Applicable for U.S. unfunded, nonqualified plan.