Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) (Significant Other Observable Inputs (Level 2) [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets:    
Cash surrender value of life insurance policies $ 23.7 $ 21.4
Liabilities:    
Deferred compensation plan 14.7 13.8
Total liabilities 45.9 48.1
Cash flow swaps designated as hedges [Member]
   
Liabilities:    
Cash flow swaps 28.5 31.4
Cash flow swaps not designated as hedges [Member]
   
Liabilities:    
Cash flow swaps $ 2.7 $ 2.9