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Employee Benefit Plans (Net Periodic Pension Costs Included in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
After-Tax Amount        
Net losses reclassified from accumulated other comprehensive loss into income $ (3.7) $ (2.6) $ (12.5) $ (10.9)
Accumulated other comprehensive loss        
Before-Tax Amount        
Accumulated other comprehensive loss, beginning of period     (380.6)  
Accumulated other comprehensive, end of period (370.3)   (370.3)  
Income Tax        
Accumulated other comprehensive loss, beginning of period     (95.5)  
Accumulated other comprehensive loss, end of period (94.2)   (94.2)  
After-Tax Amount        
Accumulated other comprehensive loss, beginning of period     (285.1)  
Accumulated other comprehensive loss, end of period $ (276.1)   (276.1)  
Amortization of net actuarial losses        
Before-Tax Amount        
Amortization of prior service cost and net actual loss     9.3  
Income Tax        
Amortization of prior service cost and net actual loss     1.3  
After-Tax Amount        
Net losses reclassified from accumulated other comprehensive loss into income     8.0  
Amortization of prior service cost        
Before-Tax Amount        
Amortization of prior service cost and net actual loss     1.0  
Income Tax        
Amortization of prior service cost and net actual loss     0.0  
After-Tax Amount        
Net losses reclassified from accumulated other comprehensive loss into income     $ 1.0