SUBSEQUENT EVENTS - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions				3 Months Ended
	May. 02, 2016	Apr. 01, 2016	Feb. 03, 2016	Mar. 31, 2016	Mar. 31, 2015
Subsequent Event [Line Items]
Common dividends, declared (in dollars per share)			$ 0.41	$ 0.41	$ 0.39
Subsequent Event [Member] | Forest Park Medical Center At Frisco, LLC [Member] | Discontinued Operations, Disposed of by Sale [Member]
Subsequent Event [Line Items]
Consideration		$ 96.3
Capital lease obligations		7.3
Net cash proceeds		86.6
Additional cash expected to receive		3.5
Impairment charge on investment		29.8
Loan loss reserve in period		3.1
Guarantees		$ 21.3
Subsequent Event [Member] | Dividend Declared [Member]
Subsequent Event [Line Items]
Common dividends, declared (in dollars per share)	$ 0.42
Preferred stock dividends, declared (in dollars per share)	$ 0.4453125