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Employee Benefit Plans (Net Periodic Pension Costs Included in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Before-Tax Amount      
Accumulated other comprehensive loss, before tax, beginning of period $ (341.5) $ (279.4)  
Net loss recognized due to settlement, before tax 0.3 0.6  
Net gain recognized due to curtailment, before tax   (0.5)  
Net actuarial (loss) gain arising during the year, before tax 4.2 (72.8)  
Amortization of prior service cost, before tax 0.6 1.0  
Amortization of net actuarial losses 8.1 9.6  
Prior service cost arising during the year, before tax (8.3)    
Accumulated other comprehensive loss, before tax, end of period (336.6) (341.5) $ (279.4)
Income Tax      
Accumulated other comprehensive loss, tax, beginning of period (88.2) (73.0)  
Net loss recognized due to settlement, tax 0.1 0.2  
Net gain recognized due to curtailment, tax   (0.1)  
Net actuarial (loss) gain arising during the year, tax 2.1 (18.0)  
Amortization of prior service costs, tax 0.2 0.4  
Amortization of net actuarial losses, tax 1.8 2.3  
Prior service cost arising during the year, tax (3.6)    
Accumulated other comprehensive loss, tax, end of period (87.6) (88.2) (73.0)
After-Tax Amount      
Accumulated other comprehensive loss, after tax, beginning of period (253.3) (206.4)  
Net loss recognized due to settlement 0.2 0.4 0.0
Net gain recognized due to curtailment 0.0 (0.4) 0.0
Net actuarial (loss) gain arising during the year, after tax 2.1 (54.8) 45.2
Amortization of prior service costs, after tax 0.4 0.6 0.6
Amortization of net actuarial losses included in net periodic pension cost 6.3 7.3 10.7
Prior service cost arising during year (4.7) 0.0 0.0
Accumulated other comprehensive loss, after tax, end of period $ (249.0) $ (253.3) $ (206.4)