STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS
Total (net) effect of statutory surplus	$ (50.0)	$ (166.0)
Non-admission of goodwill
STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS
Total (net) effect of statutory surplus		(159.0)
Report BOLI Separate Accounts at Book Value
STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS
Total (net) effect of statutory surplus	(1.0)	(7.0)
Reserving difference related to a captive insurance company
STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS
Total (net) effect of statutory surplus	(49.0)
Accounting for Letters of Credit as admitted assets
STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS
Total (net) effect of statutory surplus	1,205.0	1,015.0
Accounting for Red Mountain Note as admitted asset
STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS
Total (net) effect of statutory surplus	300.0
Reserving based on state specific actuarial practices
STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS
Total (net) effect of statutory surplus	$ 95.0	$ 84.0