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Fair Value of Financial Instruments - Summary of Carrying Amounts and Estimated Fair Values of Long-Term Debt and Commodity Purchase Contracts (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt issuance costs		$ 3.0
4.625 Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (as a percent)	4.625%		4.625%
Debt issuance costs	$ 9.2		$ 9.6
4.875 Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate (as a percent)	4.875%		4.875%
Debt issuance costs	$ 5.6		$ 5.8
Term Loan Due 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred financing fees	3.0		3.1
Level 1 [Member] \| Carrying Reported Amount Fair Value Disclosure [Member] \| 4.625 Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	678.8		678.4
Level 1 [Member] \| Carrying Reported Amount Fair Value Disclosure [Member] \| 4.875 Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	444.4		444.2
Level 1 [Member] \| Estimate of Fair Value Fair Value Disclosure [Member] \| 4.625 Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	666.9		635.1
Level 1 [Member] \| Estimate of Fair Value Fair Value Disclosure [Member] \| 4.875 Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	440.7		408.4
Level 2 [Member] \| Carrying Reported Amount Fair Value Disclosure [Member] \| Term Loan Due 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	243.9		244.4
Level 2 [Member] \| Carrying Reported Amount Fair Value Disclosure [Member] \| Commodity Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity purchase contracts	(0.4)		(0.4)
Level 2 [Member] \| Estimate of Fair Value Fair Value Disclosure [Member] \| Term Loan Due 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	247.2		247.8
Level 2 [Member] \| Estimate of Fair Value Fair Value Disclosure [Member] \| Commodity Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commodity purchase contracts	$ (0.4)		$ (0.4)