NOTES PAYABLE - DIRECT CORPORATE OBLIGATIONS (SOURCES AND USES OF RECAPITALIZATION TRANSACTIONS) (Details) - USD ($) $ in Millions		12 Months Ended
	May 19, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Sources of cash for debt refinancing	$ 925.0	$ 0.0	$ 910.0	$ 0.0
Repayments of notes payable		0.0	797.1	62.9
Accrued interest	4.3	$ 106.0	$ 90.0	$ 81.7
Debt issuance costs	16.0
General corporate purposes	109.6
Total uses	925.0
Senior Debt Obligations [Member]
Debt Instrument [Line Items]
Repayments of notes payable	502.3
Senior Secured Note 6.375 Percent [Member]
Debt Instrument [Line Items]
Repayments of notes payable	292.8
Senior Notes [Member]
Debt Instrument [Line Items]
Sources of cash for debt refinancing	825.0
Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Sources of cash for debt refinancing	$ 100.0