Financial Statement Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule Of Significant Accounting Policies [Line Items]
Property, plant and equipment, net	$ 296.2		$ 301.5
Net earnings (loss)	(10.0)	$ 6.8
Cost of sales	292.8	133.0
Selling, general and administrative expenses	15.4	$ 7.4
Overstatement Due To Depreciation Expense Error [Member]
Schedule Of Significant Accounting Policies [Line Items]
Property, plant and equipment, net			3.8
Deferred tax Liability			1.1
Net earnings (loss)			$ 2.7
Adjustment To Correct Depreciation Expense Error [Member]
Schedule Of Significant Accounting Policies [Line Items]
Cost of sales	3.7
Selling, general and administrative expenses	$ 0.1