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Pension Plans and Other Postretirement Benefits (Details 12) (Pension Benefits [Member], USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year $ 2,220.0 $ 2,232.7
Net Realized and Unrealized Gains (Losses) 293.8 164.7
Fair value of plan assets at end of year 2,329.8 2,220.0
Fixed income and cash equivalents [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at end of year 508.0 [1] 911.3 [2]
Floating rate [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at end of year 294.5 [1]  
Private equity [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at end of year 94.5 85.5
Hedge funds [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at end of year 139.7 148.9
Real estate and other [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at end of year 130.8 119.3
Significant Unobservable Inputs (Level 3) [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 340.2 293.8
Net Realized and Unrealized Gains (Losses) 39.6 16.7
Net Purchases, Issuances and Settlements 275.5 29.7
Net Transfers Into (Out Of) Level 3 0 0
Fair value of plan assets at end of year 655.3 340.2
Significant Unobservable Inputs (Level 3) [Member] | Fixed income and cash equivalents [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 1.4 [2] 1.9
Net Realized and Unrealized Gains (Losses) 0.1 0.2
Net Purchases, Issuances and Settlements (0.7) (0.7)
Net Transfers Into (Out Of) Level 3 0 0
Fair value of plan assets at end of year 0.8 [1] 1.4 [2]
Significant Unobservable Inputs (Level 3) [Member] | Floating rate [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 0  
Net Realized and Unrealized Gains (Losses) 5.4  
Net Purchases, Issuances and Settlements 289.1  
Net Transfers Into (Out Of) Level 3 0  
Fair value of plan assets at end of year 294.5 [1]  
Significant Unobservable Inputs (Level 3) [Member] | Private equity [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 85.5 82.4
Net Realized and Unrealized Gains (Losses) 3.9 0.6
Net Purchases, Issuances and Settlements 5.1 2.5
Net Transfers Into (Out Of) Level 3 0 0
Fair value of plan assets at end of year 94.5 85.5
Significant Unobservable Inputs (Level 3) [Member] | Hedge funds [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 148.9 121.9
Net Realized and Unrealized Gains (Losses) 13.8 7.1
Net Purchases, Issuances and Settlements (23.0) 19.9
Net Transfers Into (Out Of) Level 3 0 0
Fair value of plan assets at end of year 139.7 148.9
Significant Unobservable Inputs (Level 3) [Member] | Real estate and other [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 104.4 87.6
Net Realized and Unrealized Gains (Losses) 16.4 8.8
Net Purchases, Issuances and Settlements 5.0 8.0
Net Transfers Into (Out Of) Level 3 0 0
Fair value of plan assets at end of year $ 125.8 $ 104.4
[1] Global debt securities include both fixed interest rate and floating interest rate instruments. These are comprised of actively managed investments which include U.S. government and U.S. government agency securities, foreign government securities, corporate bonds, mortgage-backed securities and other debt securities, and include both investment grade and non-investment grade debt, public and private debt, and secured and unsecured debt investments. To mitigate risk, investment managers have limitations regarding the amount of investment in particular securities and the credit quality of such investments.
[2] Fixed income investments are comprised of actively managed investments which include U.S. government and U.S. government agency securities, corporate bonds, mortgage-backed securities and other fixed income securities. To mitigate risk, investment managers have limitations regarding the amount of investment in particular securities and the credit quality of such investments.