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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	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt issuance costs		$ 3.5
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	$ 8.8		$ 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	$ 5.4		$ 5.8
Term Loan Due 2022 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred financing fees	2.8		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	679.2		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	444.6		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	703.5		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	461.3		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	243.5		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	1.2		(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	246.6		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	$ 1.2		$ (0.4)