Accounts Receivable (Transactions Affecting The Allowance For Doubtful Accounts) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Accounts Receivable [Abstract]
Balance, beginning of year	$ 71.0	$ 70.3	$ 80.5
Provisions charged to expense	18.8	22.8	19.7
Write-offs and other	(27.2)	(22.1)	(29.9)
Balance, end of year	$ 62.6	$ 71.0	$ 70.3