SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accumulated Provision for Uncollectible Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, at beginning of year	$ 5.3	$ 5.2	$ 5.6
Additions charged to expenses	11.8	16.8	15.1
Additions charged to other accounts	0	0	0
Deductions from Reserves, Net	10.4	16.7	15.5
Balance, at end of period	6.7	5.3	5.2
Reserve for Impaired Notes Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, at beginning of year	6.1	9.2	6.3
Additions charged to expenses	9.6	1.2	2.9
Additions charged to other accounts	0	0	0
Deductions from Reserves, Net	0	4.3	0
Balance, at end of period	15.7	6.1	9.2
Restructuring Costs [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, at beginning of year	0.4	0.5	0.6
Additions charged to expenses	0	0	0
Additions charged to other accounts	0	0	0
Deductions from Reserves, Net	0	0.1	0.1
Balance, at end of period	$ 0.4	$ 0.4	$ 0.5