Consolidated Statement of Operations (Unaudited) (Parenthetical) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statement of Operations [Abstract]
Retail pharmacy co-payments included in network revenues	$ 1,390.4	$ 1,478.5	$ 4,374.0	$ 4,688.4