Supplementary Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2013

Supplemental Cash Flow Elements [Abstract]

Schedule of supplementary cash flow information

(in millions)	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2013			2012			2013			2012
Change in working capital accounts:
Accounts receivable	$	3.0		$	(10.7	)	$	(2.9	)	$	9.5
Product inventory	3.8			(17.5		)	4.4			(34.9		)
Material and supplies inventory	(3.5		)	(2.0		)	(6.1		)	(0.6		)
Prepaid expenses and other current assets	(1.4		)	2.8			(9.2		)	0.6
Income and mining taxes receivable	3.8			(6.0		)	8.4			(5.3		)
Accounts payable and accrued liabilities	1.1			12.1			(6.0		)	(5.7		)
Income, mining and other taxes payable	(0.4		)	(2.2		)	(0.4		)	(1.0		)
	$	6.4		$	(23.5	)	$	(11.8	)	$	(37.4	)
Cash interest paid	$	27.5		$	13.2		$	35.4		$	13.4
Income and mining taxes paid, net	$	1.4		$	8.9		$	0.3		$	11.1

Schedule of non-cash investing and financing activities

Non-cash Investing and Financing Activities

(in millions)	For the Three Months Ended June 30,					For the Six Months Ended June 30,
	2013		2012			2013		2012
Investing activities
Acquisition of property, plant and equipment under the Equipment Facility (see Note 7)	$	—	$	(3.7	)	$	—	$	(3.7	)
Increase in capital expenditure accrual	$	14.0	$	0.1		$	—	$	20.2
Capitalized debt costs (1)	$	25.8	$	11.3		$	49.5	$	17.9
Financing activities
Capital leases (2)	$	—	$	3.7		$	—	$	3.7