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Employee Benefit Plans Components of Net Periodic Benefit Cost (Credit) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 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 1.6 2.2
Interest cost 8.8 9.2 17.6 18.4
Expected asset return (8.0) (7.9) (16.0) (15.8)
Amortized loss 1.8 1.1 3.6 2.2
Net periodic benefit cost (credit) 3.4 3.5 6.8 7.0
Defined benefit plan, estimated future employer contributions in current fiscal year 35   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 0.2 0.4
Interest cost 3.9 4.3 7.8 8.6
Amortized loss 0.2 0.1 0.4 0.2
Amortized prior service credit (0.5) (0.8) (1.0) (1.6)
Curtailment gain 0 0 (21.8) 0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements (5.2) 0 (5.2) 0
Net periodic benefit cost (credit) (1.5) 3.8 (19.6) 7.6
Defined benefit plan, estimated future employer contributions in current fiscal year 16   16  
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