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Employee Benefit Plans Pre-tax Amounts Recorded in AOCI (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Impact on accumulated other comprehensive income (loss), curtailment gain (loss) $ 21.8  
Pension Plan, Defined Benefit [Member]
    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial gain (loss) (298.6) (194.3)
Net prior service credit (cost) (4.7) 0.8
Total amounts recorded (303.3) (193.5)
Other Postretirement Benefit Plan, Defined Benefit [Member]
    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial gain (loss) 3.3 4.9
Net prior service credit (cost) 11.8 18.1
Total amounts recorded 15.1 23.0
Pension and other postretirement benefits, reduction in accumulated other comprehensive loss due to settlement gain $ 0.5