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Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Acceleration of prior service cost due to SERP remeasurement $ 4.7        
Change in postretirement benefits and other long-term liabilities due to SERP remeasurement 16.4   16.4    
Impact on accumulated other comprehensive income (loss) due to SERP remeasurement 13.7   13.7    
Impact on accumulated other comprehensive loss due to curtailment gain       21.8  
Pension and OPEB, period expense, other       28.7  
Pension Plans, Defined Benefit [Member]
          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Service cost 0.8 0.7 2.6 2.3  
Interest cost 8.5 8.9 25.5 26.5  
Expected asset return (11.5) (8.0) (34.5) (24.0)  
Amortized loss 2.2 1.9 7.0 5.5  
Amortized prior service cost (credit) 4.8 0.1 5.4 0.1  
Net periodic benefit cost 4.8 3.6 6.0 10.4  
Other Postretirement Benefit Plans, Defined Benefit [Member]
          
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Service cost 0.1 0.1 0.3 0.3  
Interest cost 3.3 3.8 9.9 11.6  
Amortized loss 0.2 0.1 0.6 0.5  
Amortized prior service cost (credit) (0.4) (0.3) (1.3) (1.3)  
Curtailment gain 0 0 0 (21.8)  
Settlement 0 0 0 (5.2)  
Other postretirement benefit cost (credit) 3.2 3.7 9.5 (15.9)  
Defined benefit plan, settlements, benefit obligation       4.7  
Pension and other postretirement benefits, reduction in accumulated other comprehensive loss due to settlement gain       0.5  
Defined benefit plan, estimated future employer contributions in current fiscal year         $ 15