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Retirement Plans and Post Retirement Benefits Asset Allocation and Fair Value of Plan Assets (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Target Allocations [Abstract]      
Equity securities 36.80%    
Debt securities 37.30%    
Real estate 8.00%    
Other, including cash and cash equivalents 17.90%    
Target allocation 1    
Actual Allocation [Abstract]      
Equity securities 36.40% 50.60%  
Debt securities 37.80% 23.60%  
Real estate 5.80% 5.90%  
Other, including cash and cash equivalents 20.00% 19.90%  
Actual allocation 100.00% 100.00%  
Defined benefit plan, fair value of plan assets $ 259.3 $ 247.1 $ 255.2
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 101.1 97.0  
Significant Other Observable Inputs (Level 2) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 93.5 89.2  
Significant Unobservable Inputs (Level 3) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 64.7 60.9 59.3
Domestic stock funds [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 54.6 [1] 78.4 [1]  
Domestic stock funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 25.0 [1] 47.0 [1]  
Domestic stock funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 29.6 [1] 31.4 [1]  
Domestic stock funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1] 0 [1]  
International stock funds [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 39.6 [1] 46.4 [1]  
International stock funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 12.1 [1] 23.2 [1]  
International stock funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 27.5 [1] 23.2 [1]  
International stock funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1] 0 [1]  
Domestic bond funds [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 52.2 [2] 26.5 [1]  
Domestic bond funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 52.2 [1] 26.5 [1]  
Domestic bond funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1] 0 [1]  
Domestic bond funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1] 0 [1]  
International bond funds [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 34.0 [2] 31.6 [2]  
International bond funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1]    [1]  
International bond funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 34.0 [1] 31.6 [1]  
International bond funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1] 0 [1]  
Diversified real asset funds [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 11.8 [2]    
Diversified real asset funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 11.8 [2]    
Diversified real asset funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [2]    
Diversified real asset funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [2]    
Real Estate [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 15.2 [3] 14.5 [3]  
Real Estate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [3] 0 [3]  
Real Estate [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [3] 0 [3]  
Real Estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 15.2 [3] 14.5 [3] 13.9
Multi-strategy Funds [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 49.5 [4] 46.4 [4]  
Multi-strategy Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [4] 0 [4]  
Multi-strategy Funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 [4] 0 [4]  
Multi-strategy Funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 49.5 [4] 46.4 [4] 45.4
Cash and Cash Equivalents [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 2.4 3.3  
Cash and Cash Equivalents [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 0 0.3  
Cash and Cash Equivalents [Member] | Significant Other Observable Inputs (Level 2) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets 2.4 3.0  
Cash and Cash Equivalents [Member] | Significant Unobservable Inputs (Level 3) [Member]
     
Actual Allocation [Abstract]      
Defined benefit plan, fair value of plan assets $ 0 $ 0  
[1] Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
[2] Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.
[3] Real estate investments are primarily invested in U.S. commercial real estate.
[4] The multi-strategy funds invest in various hedge funds of fund strategies.