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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, 2012
Mar. 31, 2011
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 0.8 1.1
Interest cost 8.8 9.2
Expected asset return (8.0) (7.9)
Amortized loss 1.8 1.1
Net periodic benefit cost (credit) 3.4 3.5
Defined benefit plan, estimated future employer contributions in current fiscal year 35  
Other Postretirement Benefit Plans, Defined Benefit [Member]
    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost 0.1 0.2
Interest cost 3.9 4.3
Amortized loss 0.2 0.1
Amortized prior service credit (0.5) (0.8)
Curtailment gain (21.8) 0
Net periodic benefit cost (credit) (18.1) 3.8
Defined benefit plan, estimated future employer contributions in current fiscal year $ 16