CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
CONSOLIDATED BALANCE SHEETS
Accounts receivable, allowance for doubtful accounts	$ 33.4	$ 33.3
Property and equipment, accumulated depreciation	1,063.1	1,024.3
Customer relationships, accumulated amortization	3,974.3	3,839.0
Other intangibles, accumulated amortization	$ 1,592.3	$ 1,544.0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	1,000	1,000
Common stock, issued shares (in shares)	1,000	1,000