ACCUMULATED OTHER COMPREHENSIVE LOSS - Reclassification out of Accumulated Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	[1]			$ (587.5)
Ending balance		$ (559.6)		(559.6)
Other Comprehensive Income (Loss), Tax [Abstract]
Reclassifications into earnings - tax expense (benefit)		0.4	$ 0.4	1.2	$ 0.6
Change in fair value - tax expense (benefit)		0.1	(0.9)	(1.1)	(2.3)
Deferred Gain (Loss) - Hedging [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance				(3.8)
Ending balance		(3.7)		(3.7)
Deferred Gain (Loss) - Hedging [Member] | Interest rate swap [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance		(4.5)	(4.2)	(3.8)	(2.2)
Ending balance		(3.7)	(4.9)	(3.7)	(4.9)
Deferred Gain (Loss) - Hedging [Member] | Interest rate swap [Member] | Interest expense [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Reclassifications into earnings, net of tax		0.7	0.7	2.0	0.9
Change in fair value, net of tax		$ 0.1	$ (1.4)	$ (1.9)	$ (3.6)

[1] Adjusted as a result of the adoption of certain accounting pronouncements beginning on January 1, 2016. See Note 1, "Description of Business and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements" for details of these adjustments.