General - Health Care Reform (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
General
Health Insurer Fee (HIF) fiscal year annual fees paid during the period			$ 26.5
Health Insurer Fee (HIF) projected fees under Affordable Care Act	$ 28.4
HIF fees expensed	7.1	$ 6.9
Amount of revenues associated with accrual for reimbursement of economic impact of HIF fees from its customers	$ 11.3	$ 11.7