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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Target Allocations [Abstract]      
Defined Benefit Plan, Actual Plan Asset Allocation 100.00% 100.00%  
Target allocation 1    
Defined benefit plan, fair value of plan assets $ 270.3 $ 259.3 $ 247.1
Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 148.7 101.1  
Fair Value, Inputs, Level 2
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 79.9 93.5  
Significant Unobservable Inputs (Level 3)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 41.7 64.7 60.9
Equity Securities
      
Target Allocations [Abstract]      
Equity securities 49.10%    
Defined Benefit Plan, Actual Plan Asset Allocation 46.40% 36.40%  
Debt Securities
      
Target Allocations [Abstract]      
Equity securities 24.90%    
Defined Benefit Plan, Actual Plan Asset Allocation 36.80% 37.80%  
Real Estate
      
Target Allocations [Abstract]      
Equity securities 8.00%    
Defined Benefit Plan, Actual Plan Asset Allocation 6.20% 5.80%  
Domestic stock funds
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 83.0 [1] 54.6 [1]  
Domestic stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 68.8 [1] 25.0 [1]  
Domestic stock funds | Fair Value, Inputs, Level 2
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 14.2 [1] 29.6 [1]  
Domestic stock funds | Significant Unobservable Inputs (Level 3)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1] 0 [1]  
International stock funds
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 42.4 [1] 39.6 [1]  
International stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 14.4 [1] 12.1 [1]  
International stock funds | Fair Value, Inputs, Level 2
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 28.0 [1] 27.5 [1]  
International stock funds | Significant Unobservable Inputs (Level 3)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1] 0 [1]  
Domestic bond funds
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 54.4 [2] 52.2 [1]  
Domestic bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 54.4 [1] 52.2 [1]  
Domestic bond funds | Fair Value, Inputs, Level 2
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1] 0 [1]  
Domestic bond funds | Significant Unobservable Inputs (Level 3)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1] 0 [1]  
International bond funds
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 34.2 [2] 34.0 [2]  
International bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1] 0 [1]  
International bond funds | Fair Value, Inputs, Level 2
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 34.2 [1] 34.0 [1]  
International bond funds | Significant Unobservable Inputs (Level 3)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [1] 0 [1]  
Diversified real asset funds
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 11.1 [2] 11.8 [2]  
Diversified real asset funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 11.1 [2] 11.8 [2]  
Diversified real asset funds | Fair Value, Inputs, Level 2
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [2] 0 [2]  
Diversified real asset funds | Significant Unobservable Inputs (Level 3)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [2] 0 [2]  
Real Estate
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 16.5 [3] 15.2 [3]  
Real Estate | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [3] 0 [3]  
Real Estate | Fair Value, Inputs, Level 2
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [3] 0 [3]  
Real Estate | Significant Unobservable Inputs (Level 3)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 16.5 [3] 15.2 [3] 14.5
Multi-strategy Funds
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 25.2 [4] 49.5 [4]  
Multi-strategy Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [4] 0 [4]  
Multi-strategy Funds | Fair Value, Inputs, Level 2
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 [4] 0 [4]  
Multi-strategy Funds | Significant Unobservable Inputs (Level 3)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 25.2 [4] 49.5 [4] 46.4
Cash and Cash Equivalents
      
Target Allocations [Abstract]      
Equity securities 18.00%    
Defined Benefit Plan, Actual Plan Asset Allocation 10.60% 20.00%  
Defined benefit plan, fair value of plan assets 3.5 2.4  
Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 0 0  
Cash and Cash Equivalents | Fair Value, Inputs, Level 2
      
Target Allocations [Abstract]      
Defined benefit plan, fair value of plan assets 3.5 2.4  
Cash and Cash Equivalents | Significant Unobservable Inputs (Level 3)
      
Target Allocations [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 that employ a fund of funds strategy.