SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of income (loss) from continuing operations (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Income (loss) from continuing operations	$ 320.6	$ 93.3	$ (118.9)
Income from continuing operations allocated to non-vested share awards	1.5	0.0	0.0
Income (loss) from continuing operations available to shareholders	$ 322.1	$ 93.3	$ (118.9)

Income (Loss) From Continuing Operations Available To Shareholders

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- References

No definition available.

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- Definition

Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683

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- Definition

Amount of preferred stock dividends and adjustments classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 7
-Subparagraph (SAB Topic 5.Q)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187283-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1377-109256

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