CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 322.8	$ 526.8
Accounts receivable	44.8	52.9
Accounts receivable-related parties	6.5	6.4
Product inventory	98.8	110.8
Material and supplies inventory	67.8	48.4
Prepaid expenses and other current assets	8.1	5.8
Income and mining taxes receivable	5.6	16.0
Restricted cash	21.8	37.1
Total current assets	576.2	804.2
Property, plant, equipment and development, net	2,824.4	2,538.9
Restricted cash	5.7	5.7
Reclamation deposits	7.5	30.1
Other assets	27.3	31.3
Total assets	3,441.1	3,410.2
Current liabilities
Accounts payable and accrued liabilities	110.6	128.5
Income, mining and other taxes payable	0.6	0.6
Current portion of Gold Stream deferred revenue	22.7	0
Current portion of long-term debt	15.3	16.6
Current portion of long-term capital lease obligations	20.6	14.1
Deferred income tax liabilities	9.4	5.9
Other current liabilities	12.3	13.8
Total current liabilities	191.5	179.5
Gold Stream deferred revenue	758.8	669.6
Long-term debt	910.7	921.8
Long-term capital lease obligations	71.6	58.0
Other liabilities	7.3	5.3
Asset retirement obligations	36.1	36.6
Deferred income tax liabilities	105.3	137.5
Total liabilities	2,081.3	2,008.3
Commitments and contingencies
Shareholders' equity
Common stock, no-par, 171,452,069 and 168,726,984 shares issued and outstanding as of September 30, 2013 and December 31, 2012, respectively	1,028.9	1,017.9
Additional paid-in capital	229.7	233.8
Retained earnings	87.8	92.3
Accumulated other comprehensive income (loss)	13.4	57.9
Total shareholders' equity	1,359.8	1,401.9
Total liabilities and shareholders' equity	$ 3,441.1	$ 3,410.2