Condensed Consolidating Financial Information - Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities
Net cash provided by (used in) operating activities	$ 35.7	$ 13.4
Cash flows from investing activities
Capital expenditures	(7.6)	(14.1)
Proceeds from sale of investment in joint venture	8.0	0.0
Proceeds from sale of property, plant, and equipment	0.0	0.1
Net cash provided by (used in) investing activities	0.4	(14.0)
Cash flows from financing activities
Borrowings on ABL Facility	0.6	174.2
Payments on ABL Facility	(0.6)	(163.2)
Principal payments under capital lease obligation	(0.5)	0.0
Dividends paid	(1.6)	(1.6)
Distributions to noncontrolling interest owners	(0.2)	0.0
Proceeds from exercise of stock options	0.1	0.1
Excess tax benefit from share-based compensation	0.1	0.2
Share repurchases	(0.3)	(0.4)
Net cash (used in) provided by financing activities	(2.4)	9.3
Effect of foreign currency exchange rates	0.1	(0.1)
Net increase (decrease) in cash	33.8	8.6
Cash at beginning of period	44.6	10.8
Cash at end of period	78.4	19.4
Eliminations [Member]
Cash flows from operating activities
Net cash provided by (used in) operating activities	(1.9)	(4.3)
Cash flows from investing activities
Capital expenditures	0.0	0.0
Proceeds from sale of investment in joint venture	0.0
Proceeds from sale of property, plant, and equipment		0.0
Net cash provided by (used in) investing activities	0.0	0.0
Cash flows from financing activities
Borrowings on ABL Facility	0.0	0.0
Payments on ABL Facility	0.0	0.0
Principal payments under capital lease obligation	0.0
Dividends paid	2.2	1.6
Distributions to noncontrolling interest owners	0.0
Proceeds from exercise of stock options	0.0	0.0
Excess tax benefit from share-based compensation	0.0	0.0
Share repurchases	0.0	0.0
Net cash (used in) provided by financing activities	2.2	1.6
Effect of foreign currency exchange rates	0.0	0.0
Net increase (decrease) in cash	0.3	(2.7)
Cash at beginning of period	(1.4)	0.0
Cash at end of period	(1.1)	(2.7)
Parent [Member]
Cash flows from operating activities
Net cash provided by (used in) operating activities	1.7	1.7
Cash flows from investing activities
Capital expenditures	0.0	$ 0.0
Proceeds from sale of investment in joint venture	0.0
Proceeds from sale of property, plant, and equipment
Net cash provided by (used in) investing activities	0.0	$ 0.0
Cash flows from financing activities
Borrowings on ABL Facility	0.0	0.0
Payments on ABL Facility	0.0	0.0
Principal payments under capital lease obligation	0.0
Dividends paid	(1.6)	(1.6)
Distributions to noncontrolling interest owners	0.0
Proceeds from exercise of stock options	0.1	0.1
Excess tax benefit from share-based compensation	0.1	0.2
Share repurchases	(0.3)	(0.4)
Net cash (used in) provided by financing activities	(1.7)	(1.7)
Effect of foreign currency exchange rates	0.0	0.0
Net increase (decrease) in cash	0.0	0.0
Cash at beginning of period	0.0	0.0
Cash at end of period	0.0	0.0
Issuer [Member]
Cash flows from operating activities
Net cash provided by (used in) operating activities	35.1	2.1
Cash flows from investing activities
Capital expenditures	0.0	$ (0.1)
Proceeds from sale of investment in joint venture	0.0
Proceeds from sale of property, plant, and equipment
Net cash provided by (used in) investing activities	0.0	$ (0.1)
Cash flows from financing activities
Borrowings on ABL Facility	0.6	174.2
Payments on ABL Facility	(0.6)	(163.2)
Principal payments under capital lease obligation	0.0
Dividends paid	(1.6)	(1.6)
Distributions to noncontrolling interest owners	0.0
Proceeds from exercise of stock options	0.0	0.0
Excess tax benefit from share-based compensation	0.0	$ 0.0
Share repurchases	0.0
Net cash (used in) provided by financing activities	(1.6)	$ 9.4
Effect of foreign currency exchange rates	0.0	0.0
Net increase (decrease) in cash	33.5	11.4
Cash at beginning of period	37.6	3.3
Cash at end of period	71.1	14.7
Guarantor Subsidiaries [Member]
Cash flows from operating activities
Net cash provided by (used in) operating activities	(1.6)	12.5
Cash flows from investing activities
Capital expenditures	(7.6)	(13.9)
Proceeds from sale of investment in joint venture	8.0
Proceeds from sale of property, plant, and equipment		0.1
Net cash provided by (used in) investing activities	0.4	(13.8)
Cash flows from financing activities
Borrowings on ABL Facility	0.0	0.0
Payments on ABL Facility	0.0	0.0
Principal payments under capital lease obligation	(0.5)
Dividends paid	0.0	0.0
Distributions to noncontrolling interest owners	0.0
Proceeds from exercise of stock options	0.0	0.0
Excess tax benefit from share-based compensation	0.0	$ 0.0
Share repurchases	0.0
Net cash (used in) provided by financing activities	(0.5)	$ 0.0
Effect of foreign currency exchange rates	0.0	0.0
Net increase (decrease) in cash	(1.7)	(1.3)
Cash at beginning of period	3.8	3.9
Cash at end of period	2.1	2.6
Non-Guarantor Subsidiaries [Member]
Cash flows from operating activities
Net cash provided by (used in) operating activities	2.4	1.4
Cash flows from investing activities
Capital expenditures	$ 0.0	$ (0.1)
Proceeds from sale of investment in joint venture
Proceeds from sale of property, plant, and equipment
Net cash provided by (used in) investing activities	$ 0.0	$ (0.1)
Cash flows from financing activities
Borrowings on ABL Facility	0.0	0.0
Payments on ABL Facility	0.0	0.0
Principal payments under capital lease obligation	0.0
Dividends paid	(0.6)	0.0
Distributions to noncontrolling interest owners	(0.2)
Proceeds from exercise of stock options	0.0	0.0
Excess tax benefit from share-based compensation	0.0	$ 0.0
Share repurchases	0.0
Net cash (used in) provided by financing activities	(0.8)	$ 0.0
Effect of foreign currency exchange rates	0.1	(0.1)
Net increase (decrease) in cash	1.7	1.2
Cash at beginning of period	4.6	3.6
Cash at end of period	$ 6.3	$ 4.8