Revenue Recognition and Concentration of Credit Risk (Net Provider Payments) (Details) (Ancillary Network, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Ancillary Network
Segment Reporting Information [Line Items]
Revenues, net of provider payments	$ 1.7	$ 1.7	$ 4.6	$ 5.0