STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
STATUTORY REPORTING PRACTICES AND OTHER REGULATORY MATTERS
Statutory net income	$ 440.0	$ 554.2	$ 165.5
Statutory capital and surplus	$ 3,800.0	$ 3,500.0
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)	$ 165.6
Consolidated shareowners' equity which represented net assets of the Company's insurance subsidiaries that is required to be maintained as minimum capital	960.2
Total adjusted capital	4,100.0
Action level RBC	$ 720.6
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	$ 43.8