Commitments and Contingencies Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Schedule of future minimum rental payments

Minimum rental commitments under operating leases at December 31, 2015 were as follows (in millions of dollars):

	Year Ended December 31,
	2016		2017		2018		2019		2020		2021 and Thereafter
Minimum rental commitments	$	6.2	$	5.1	$	4.1	$	3.9	$	2.2	$	25.8

Schedule of future purchase obligations

mounts due under purchase obligations as of December 31, 2015 were as follows (in millions of dollars):

	Year Ended December 31,
	2016		2017		2018		2019		2020		2021 and Thereafter
Raw materials	$	179.3	$	—	$	—	$	—	$	—	$	—
Energy	10.3		9.5		5.6		0.6		0.6		1.5
Capital equipment	5.2		0.1		—		—		—		—
Total purchase obligations	$	194.8	$	9.6	$	5.6	$	0.6	$	0.6	$	1.5

Schedule of changes in environmental contingencies

The following table presents the changes in such accruals, which are primarily included in Long-term liabilities (in millions of dollars):

	Year Ended December 31,
	2015			2014			2013
Beginning balance	$	19.3		$	22.8		$	21.7
Additional accruals	1.3			0.8			4.5
Less expenditures	(2.0		)	(4.3		)	(3.4		)
Ending balance	$	18.6		$	19.3		$	22.8