General - Health Care Reform (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2016	Sep. 30, 2017
General
Health Insurer Fee (HIF) fiscal year annual fees paid during the period			$ 26.5
HIF fees expensed	$ 6.7	$ 19.9
Amount of revenues associated with accrual for reimbursement of economic impact of HIF fees from its customers	$ 11.0	$ 32.4
Receivables Related To Terminated Contract That Customer Has Expressed Unwillingness To Pay				$ 13.3