Stockholders' Equity (Deficit), Accumulated Other Comprehensive Income (Loss) and Noncontrolling Interest - Change in Stockholders' Equity (Deficit) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Beginning Balance	$ 178.6	$ 75.9
Beginning Balance, shares	37,996,261
Beginning Balance Treasury Stock, shares	212,500
Net income	$ 16.4	29.6
Foreign currency translation	(8.5)	3.0
Changes in defined benefit pension and other post-retirement benefit plans, net of tax of $0.6 and $0.3	1.8	0.9
Stock-based compensation expense	0.6	0.8
Cash flow hedge - interest rate swap, net of tax of $1.2 and $0.1	(3.5)	(0.4)
Ending Balance	$ 185.4	112.8
Ending Balance, shares	37,996,261
Ending Balance Treasury Stock, shares	212,500
ASU 2016-02 [Member]
Adoption of accounting principal		3.0
Common Stock [Member]
Beginning Balance	$ 0.4	$ 0.4
Beginning Balance, shares	37,996,000	37,656,000
Stock-based compensation expense, shares		10,000
Ending Balance	$ 0.4	$ 0.4
Ending Balance, shares	37,996,000	37,666,000
Treasury Stock [Member]
Beginning Balance	$ (6.6)	$ (6.6)
Beginning Balance Treasury Stock, shares	213,000	213,000
Ending Balance	$ (6.6)	$ (6.6)
Ending Balance Treasury Stock, shares	213,000	213,000
Capital in Excess of Par Value [Member]
Beginning Balance	$ 381.2	$ 381.0
Stock-based compensation expense	0.6	0.8
Ending Balance	381.8	381.8
Retained Earnings (Accumulated Deficit) [Member]
Beginning Balance	99.6	14.2
Net income	16.4	29.5
Ending Balance	116.0	46.7
Retained Earnings (Accumulated Deficit) [Member] | ASU 2016-02 [Member]
Adoption of accounting principal		3.0
Foreign Currency Translation [Member]
Beginning Balance	(48.6)	(52.8)
Foreign currency translation	(8.5)	2.9
Ending Balance	(57.1)	(49.9)
Benefit Plan Liabilities [Member]
Beginning Balance	(253.1)	(264.0)
Changes in defined benefit pension and other post-retirement benefit plans, net of tax of $0.6 and $0.3	1.8	0.9
Ending Balance	(251.3)	(263.1)
Cash Flow Hedge - Interest Rate Swap [Member]
Beginning Balance	(0.3)	1.0
Cash flow hedge - interest rate swap, net of tax of $1.2 and $0.1	(3.5)	(0.4)
Ending Balance	(3.8)	0.6
Non-controlling Interest [Member]
Beginning Balance	6.0	2.7
Net income		0.1
Foreign currency translation		0.1
Ending Balance	$ 6.0	$ 2.9