BASIC AND DILUTED EARNINGS PER COMMON SHARE - Components of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Numerator:
Loss from continuing operations, net of taxes	$ (121.4)	$ (37.1)	[1]	$ (213.1)	$ (74.8)	[1]
(Loss) income from discontinued operations, net of taxes	(1.1)	0.6	[1]	0.3	0.9	[1]
Net loss	$ (122.5)	$ (36.5)	[1]	$ (212.8)	$ (73.9)	[1]
Denominator:
Weighted average common shares outstanding - Basic (shares)	52,823,326	53,096,935	[1]	52,748,913	52,569,473	[1]
Effect of dilutive restricted stock (shares)	0	0		0	0
Weighted average common shares outstanding - Diluted (shares)	52,823,326	53,096,935	[1]	52,748,913	52,569,473	[1]
Basic (loss) earnings per common share:
Continuing operations (usd per share)	$ (2.30)	$ (0.70)	[1]	$ (4.04)	$ (1.42)	[1]
Discontinued operations (usd per share)	(0.02)	0.00	[1]	0.01	0.01	[1]
Net (loss) income (usd per share)	(2.32)	(0.70)	[1]	(4.03)	(1.41)	[1]
Diluted (loss) earnings per common share:
Continuing operations (usd per share)	(2.30)	(0.70)	[1]	(4.04)	(1.42)	[1]
Discontinued operations (usd per share)	(0.02)	0.00	[1]	0.01	0.01	[1]
Net (loss) income (usd per share)	$ (2.32)	$ (0.70)	[1]	$ (4.03)	$ (1.41)	[1]
Restricted Stock
Diluted (loss) earnings per common share:
Unvested restricted stock awards under the Stock Plan (shares)	10,733	0		53,981	43,120

[1] Adjusted as a result of the adoption of certain accounting pronouncements during 2018. See Note 1, "Description of Business and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements," for details of these adjustments.