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Employee Benefit Plans (Net Periodic Pension Costs Included in Accumulated Other Comprehensive Income (Loss)) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive loss, before tax, beginning of period $ (355.2)    
Accumulated other comprehensive loss, tax, beginning of period (92.3)    
Accumulated other comprehensive loss, after tax, beginning of period (262.9)    
Net loss recognized due to settlement, before tax 0.1    
Net loss recognized due to settlement, tax 0.1    
Net loss recognized due to settlement, after tax 0    
Net actuarial gain arising during the year, before tax 60.1    
Net actuarial gain arising during the year, tax 14.9    
Net actuarial gain arising during the year, after tax 45.2 (28.2) (61.8)
Amortization of prior service cost 1.1    
Amortization of prior service costs, tax 0.5    
Amortization of prior service costs, after tax 0.6 0.4 0.1
Amortization of net actuarial loss 14.5    
Amortization of net actuarial loss, tax 3.8    
Amortization of net actuarial losses included in net periodic pension cost 10.7 7.6 5.6
Accumulated other comprehensive loss, before tax, end of period (279.4) (355.2)  
Accumulated other comprehensive loss, tax, end of period (73.0) (92.3)  
Accumulated other comprehensive loss, after tax, end of period $ (206.4) $ (262.9)