Significant Accounting Policies (Health Plan Services Health Care Cost) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Summary of Significant Accounting Policies [Abstract]
Prior Years Favorable Reserve Development	$ 55.9
Provision For Adverse Deviation	52.9
Prior Years Unfavorable Reserve Development		$ 32.8