CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 402.8	$ 526.8
Accounts receivable	56.5	52.9
Accounts receivable-related parties	5.4	6.4
Product inventory	89.0	110.8
Material and supplies inventory	52.9	48.4
Prepaid expenses and other current assets	14.5	5.8
Income and mining taxes receivable	7.2	16.0
Restricted cash	24.4	37.1
Total current assets	652.7	804.2
Property, plant, equipment and development, net	2,685.6	2,538.9
Restricted cash	5.7	5.7
Reclamation deposits	28.5	30.1
Other assets	28.6	31.3
Total assets	3,401.1	3,410.2
Current liabilities
Accounts payable and accrued liabilities	122.4	128.5
Income, mining and other taxes payable	0.8	0.6
Current portion of long-term debt	16.0	16.6
Current portion of long-term capital lease obligations	20.6	14.1
Deferred income tax liabilities	6.3	5.9
Other current liabilities	12.7	13.8
Total current liabilities	178.8	179.5
Gold Stream deferred revenue	768.6	669.6
Long-term debt	914.4	921.8
Long-term capital lease obligations	76.6	58.0
Other liabilities	4.5	5.3
Asset retirement obligations	35.2	36.6
Deferred income tax liabilities	109.9	137.5
Total liabilities	2,088.0	2,008.3
Commitments and contingencies
Shareholders' equity
Common stock, no-par, 171,214,297 and 168,726,984 shares issued and outstanding as of June 30, 2013 and December 31, 2012, respectively	1,027.9	1,017.9
Additional paid-in capital	227.2	233.8
Retained earnings	74.0	92.3
Accumulated other comprehensive (loss) income	(16.0)	57.9
Total shareholders' equity	1,313.1	1,401.9
Total liabilities and shareholders' equity	$ 3,401.1	$ 3,410.2