SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (Allowance for doubtful accounts, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for doubtful accounts
Movement in valuation and qualifying accounts
Balance at Beginning of Period	$ 22.2	$ 17.2	$ 21.3
Additions Charged to Costs and Expenses	6.7	12.8	11.9
Deductions	8.5	8.0	13.8
Amounts Charged to Other Accounts	0.1	0.2	(2.1)
Balance at End of Period	$ 20.5	$ 22.2	$ 17.2