STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS
Statutory net income	$ 554,200,000	$ 165,500,000	$ 376,300,000
Statutory capital and surplus	3,500,000,000	2,900,000,000
Period for which dividend can be paid after written notice to the insurance commissioner	30 days
Net assets of the Company's insurance subsidiaries that are restricted from transfer (in dollars)	138,400,000
Consolidated shareowners' equity which represented net assets of the Company's insurance subsidiaries that is required to be maintained as minimum capital	730,100,000
Total adjusted capital	3,900,000,000
Action level RBC	687,800,000
RBC ratio (as a percent)	562.00%
Market value of fixed maturity and short-term investments of the company's subsidiaries deposited with regulatory authorities	$ 45,300,000