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Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Impact on accumulated other comprehensive loss due to curtailment gain   $ 21.8
Pension Plans, Defined Benefit [Member]
    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 0.9 0.8
Interest cost 8.5 8.8
Expected asset return (11.5) (8.0)
Amortized loss 2.4 1.8
Amortized prior service credit 0.3 0
Net periodic benefit cost (credit) 0.6 3.4
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
Interest cost 3.3 3.9
Amortized loss 0.2 0.2
Amortized prior service credit (0.4) (0.5)
Curtailment gain 0 (21.8)
Defined benefit plan, estimated future employer contributions in current fiscal year 15  
Other Postretirement Benefit Expense $ 3.2 $ (18.1)