Medical Claims Payable ((Favorable) Unfavorable Developments By Changes In Key Assumptions) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Medical Claims Payable [Abstract]
Assumed trend factors	$ (428.4)	$ (394.4)	$ (264.8)
Assumed completion factors	(170.7)	(119.2)	55.1
Total	$ (599.1)	$ (513.6)	$ (209.7)