OTHER OPERATING STATEMENT DATA (SCHEDULE OF CHANGES IN DEFERRED ACQUISITION COSTS) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 1,083.3	$ 770.6	$ 968.1
Additions	242.7	246.4	242.8
Amortization	(191.1)	(190.9)	(171.2)
Effect of reinsurance transaction	0.0	0.0	24.0
Amounts related to CLIC prior to being sold	0.0	0.0	(37.6)
Amounts related to changes in unrealized investment gains (losses) on fixed maturities, available for sale	(90.2)	257.2	(255.5)
Balance, end of year	$ 1,044.7	$ 1,083.3	$ 770.6