Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Per share amount of cumulative preferred dividends in arrears.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21488-112644

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SUBSEQUENT EVENTS - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions							3 Months Ended			9 Months Ended
	Nov. 01, 2017	Oct. 02, 2017	Sep. 28, 2017	Aug. 02, 2017	May 08, 2017	Feb. 03, 2017	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Subsequent Event [Line Items]
Common dividends, declared (in dollars per share)				$ 0.3598913	$ 0.43	$ 0.42	$ 0.3598913		$ 0.42	$ 1.21	$ 1.25
Dividend Declared [Member]
Subsequent Event [Line Items]
Common dividends, declared (in dollars per share)								$ 0.43
Subsequent Event [Member] \| Dividend Declared [Member]
Subsequent Event [Line Items]
Common dividends, declared (in dollars per share)	$ 0.5201087
Preferred stock dividends, declared (in dollars per share)	0.4453125
Subsequent Event [Member] \| Full Quarterly Dividend [Member]
Subsequent Event [Line Items]
Common dividends, declared (in dollars per share)	0.45
Subsequent Event [Member] \| Prorated Dividend Prior Quarterly Dividend [Member]
Subsequent Event [Line Items]
Common dividends, declared (in dollars per share)	$ 0.0701087
Underwriters Option [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Shares sold in offering (in shares)		2,400,000.0
Proceeds from offering		$ 48.4
Underwritten Public Offering [Member]
Subsequent Event [Line Items]
Shares sold in offering (in shares)			16,000,000
Share price (in usd per share)			$ 21.00
Proceeds from offering			$ 322.6
Underwritten Public Offering [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Share price (in usd per share)		$ 21.00