Income Taxes (Reconciliation) (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statutory federal income tax rate				35.00%	35.00%	35.00%
State and local taxes, net of federal income tax effect				6.20%	(11.10%)	1.50%
Loss on Subsidiary Stock				(0.00%)	(24.90%)	(0.00%)
Non-deductible health insurer fee				17.90%	24.80%	0.00%
Non-deductible compensation				2.40%	4.80%	3.60%
Tax exempt interest income				(1.50%)	(2.90%)	(2.40%)
Other, net				(0.80%)	1.40%	(0.70%)
Effective income tax rate				59.20%	27.10%	37.00%
Tax Benefit Due to Worthless Stock loss			$ 72.6		$ 73.7
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions				$ 3.1	25.5	$ 4.4
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions					16.4
ACA Health Insurer Fee [Member]
ACA Health Insurer Fee Payment	$ 233.0	$ 141.4		$ 233.0	$ 141.4