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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (Allowance for doubtful accounts, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance for doubtful accounts
      
Movement in valuation and qualifying accounts      
Balance at Beginning of Period $ 20.5 $ 22.2 $ 17.2
Additions Charged to Costs and Expenses 4.0 6.7 12.8
Deductions 10.4 8.5 8.0
Amounts Charged to Other Accounts 4.8 0.1 0.2
Balance at End of Period $ 18.9 $ 20.5 $ 22.2