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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
After-Tax Amount        
Net losses reclassified from accumulated other comprehensive loss $ (4.1) $ (3.6) $ (8.3) $ (6.0)
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member]        
Before-Tax Amount        
Accumulated other comprehensive loss as of December 31, 2016     (404.8)  
Accumulated other comprehensive loss as of June 30, 2017 (398.0)   (398.0)  
Income Tax        
Accumulated other comprehensive loss as of December 31, 2016     (100.3)  
Accumulated other comprehensive loss as of June 30, 2017 (99.3)   (99.3)  
After-Tax Amount        
Accumulated other comprehensive loss as of December 31, 2016     (304.5)  
Accumulated other comprehensive loss as of June 30, 2017 $ (298.7)   (298.7)  
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     6.1  
Income Tax        
Amortization of prior service cost and net actual loss     1.0  
After-Tax Amount        
Net losses reclassified from accumulated other comprehensive loss     5.1  
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     $ 0.7