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Employee Benefit Plans (Reconciliation of Level 3 Assets) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]      
Fair value of plan assets   $ 617.1  
Pension Benefits      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]      
Foreign currency exchange rate changes $ 16.5 (32.9)  
Fair value of plan assets 711.0 617.1 $ 691.8
Pension Benefits | Alternative Investments      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]      
Fair value of plan assets 35.6 34.1  
Pension Benefits | Miscellaneous Funds      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]      
Fair value of plan assets 30.8 28.2  
Level 3      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]      
Fair value of plan assets   30.5  
Level 3 | Pension Benefits      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]      
Related to assets still held at reporting 1.9 0.8  
Relating to assets sold during period 0.0 0.0  
Purchases, sales and /or settlements 1.3 3.2  
Foreign currency exchange rate changes (0.6) (1.3)  
Fair value of plan assets 33.1 30.5 27.8
Level 3 | Pension Benefits | Alternative Investments      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]      
Related to assets still held at reporting (0.1) (0.2)  
Relating to assets sold during period 0.0 0.0  
Purchases, sales and /or settlements 0.1 0.1  
Foreign currency exchange rate changes 0.0 0.0  
Fair value of plan assets 2.3 2.3 2.4
Level 3 | Pension Benefits | Miscellaneous Funds      
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [Abstract]      
Related to assets still held at reporting 2.0 1.0  
Relating to assets sold during period 0.0 0.0  
Purchases, sales and /or settlements 1.2 3.1  
Foreign currency exchange rate changes (0.6) (1.3)  
Fair value of plan assets $ 30.8 $ 28.2 $ 25.4