SHARE-BASED COMPENSATION - Performance Awards (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	7 Months Ended	12 Months Ended
Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	May 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 3.5	$ 7.9	$ 7.3	$ 4.8
Long Term Performance Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 0.3	$ 0.8	$ (0.4)	$ 0.2
No. of Stock Units
Beginning of year (in shares)	23	59	59	0
Granted (in shares)	36	182	0	23
Vested and settled (in shares)	0	0	0	0
Cancelled (in shares)	0	(67)	0	0
End of year (in shares)	59	174	59	23
Weighted Average Fair Value
Beginning of year (in USD per share)	$ 42.25	$ 37.16	$ 37.16	$ 0.00
Granted (in USD per share)	33.91	19.68	0.00	42.25
Vested and settled (in USD per share)	0.00	0.00	0.00	0.00
Cancelled (in USD per share)	0.00	30.11	0.00	0.00
Stock and stock units, end of year (in USD per share)	$ 37.16	$ 21.58	$ 37.16	$ 42.25
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation	$ 0.5		$ 0.3	$ 0.6
No. of Stock Units
Beginning of year (in shares)	28	0	13	50
Granted (in shares)	0			0
Vested and settled (in shares)	(15)		(13)	(22)
Cancelled (in shares)	0		0	0
End of year (in shares)	13		0	28
Weighted Average Fair Value
Beginning of year (in USD per share)	$ 32.86	$ 35.15	$ 35.15	$ 30.63
Granted (in USD per share)	0.00		0.00	0.00
Vested and settled (in USD per share)	30.82		35.15	27.66
Cancelled (in USD per share)	0.00		0.00	0.00
Stock and stock units, end of year (in USD per share)	$ 35.15		$ 35.15	$ 32.86

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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