Significant Accounting Policies (Health Plan Services Health Care Cost) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Health Care Organization Revenue and Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	$ (14.3)	$ (3.7)	$ (99.7)	$ (26.6)
Provision For Adverse Deviation	79.4		79.4		$ 77.7
Favorable prior period development [Member]
Health Care Organization Revenue and Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	(2.4)		(23.0)
Unfavorable Development [Member]
Health Care Organization Revenue and Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense		1.1		24.2
Provision for Adverse Deviation, Release [Member]
Health Care Organization Revenue and Expense [Line Items]
Prior Year Claims and Claims Adjustment Expense	$ (11.9)	$ (4.8)	$ (76.7)	$ (50.8)