SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts
Balance at beginning of year	$ 43.5	$ 47.1	$ 41.9
Charged to expense	34.4	26.2	35.0
Charged to other accounts	4.7	4.8	1.5
Deductions	32.8	34.6	31.3
Balance at end of year	$ 49.8	$ 43.5	$ 47.1