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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
After-Tax Amount        
Net losses reclassified from accumulated other comprehensive loss into income $ (4.5) $ (4.1) $ (8.8) $ (8.3)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]        
Before-Tax Amount        
Accumulated other comprehensive loss, beginning of period     (380.6)  
Accumulated other comprehensive, end of period (373.6)   (373.6)  
Income Tax        
Accumulated other comprehensive loss, beginning of period     (95.5)  
Accumulated other comprehensive loss, end of period (94.6)   (94.6)  
After-Tax Amount        
Accumulated other comprehensive loss, beginning of period     (285.1)  
Accumulated other comprehensive loss, end of period $ (279.0)   (279.0)  
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]        
Before-Tax Amount        
Amortization of prior service cost and net actual loss     6.3  
Income Tax        
Amortization of prior service cost and net actual loss     0.9  
After-Tax Amount        
Net losses reclassified from accumulated other comprehensive loss into income     5.4  
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Including Portion Attributable to Noncontrolling Interest [Member]        
Before-Tax Amount        
Amortization of prior service cost and net actual loss     0.7  
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     $ 0.7