Schedule II - Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 9.3	$ 8.4	$ 10.5
Charged to Expense	11.9	13.4	10.1
Charged to Other Accounts	0	(0.2)	0
Deductions	15.3	12.3	12.2
Balance at End of Period	5.9	9.3	8.4
Deferred Tax Asset Valuation Allowance [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Period	21.3	20.7	20.8
Charged to Expense	4.2	2.6	3.7
Charged to Other Accounts	0	0	0
Deductions	5.8	2.0	3.8
Balance at End of Period	$ 19.7	$ 21.3	$ 20.7