Income Taxes (Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Contingency [Line Items]
Statutory federal income tax rate	35.00%	35.00%	35.00%
State and local taxes, net of federal income tax effect	(6.90%)	6.90%	5.20%
Valuation allowance (release) against capital losses, net operating losses or tax credits	(26.50%)	21.90%	(2.50%)
Non-deductible compensation	17.70%	2.30%	1.10%
Tax exempt interest income	(12.70%)	(2.20%)	(1.20%)
Sale of subsidiaries	1.80%	(3.90%)	(1.20%)
Interest expense	5.30%	0.50%	0.00%
Lobbying expense	3.40%	0.80%	0.40%
Other, net	1.80%	1.00%	1.90%
Effective income tax rate	18.90%	62.30%	38.70%
AmCareco Litigation [Member]
Income Tax Contingency [Line Items]
Deferred tax assets	51.1