The aggregate cash deposits to be received by the reporting entity under the arrangement.

No definition available.

Name:	tc_AggregateCashDepositsToBeReceived
Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents outstanding amount of deposit received related to a purchase and sale agreement for the future sale of payable gold.

No definition available.

Name:	tc_ArrangementReserveNoncurrent
Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

The future scheduled aggregate cash deposits to be received by the reporting entity under the arrangement.

No definition available.

Name:	tc_FutureScheduledAggregateCashDepositsToBeReceived
Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The future scheduled periodic cash deposits to be received by the reporting entity under the arrangement.

No definition available.

Name:	tc_FutureScheduledPeriodicCashDepositsToBeReceived
Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The percentage of payable gold for which the reporting entity entered into an arrangement to sell.

No definition available.

Name:	tc_PercentageOfPayableGoldToBeSold
Namespace Prefix:	tc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The period whereby the outstanding deposit must be refunded.

No definition available.

Name:	tc_PeriodForWhichCashDepositCanBeUsedForPriceDifferential
Namespace Prefix:	tc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Proceeds from Gold, Cash Payment

No definition available.

Name:	tc_ProceedsFromGoldCashPayment
Namespace Prefix:	tc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The specified purchase price per ounce.

No definition available.

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Gold Stream Arrangement (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			1 Months Ended	3 Months Ended	12 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Aug. 31, 2012 Gold Stream Amended and Restated Agreements Mt. Milligan	Mar. 31, 2013 Gold Stream Amended and Restated Agreements Mt. Milligan	Dec. 31, 2012 Gold Stream Amended and Restated Agreements Mt. Milligan	Dec. 31, 2011 Gold Stream Amended and Restated Agreements Mt. Milligan	Dec. 31, 2010 Gold Stream Amended and Restated Agreements Mt. Milligan	Mar. 31, 2013 Payment, March 4, 2013 Gold Stream Amended and Restated Agreements Mt. Milligan	Mar. 31, 2013 Payment, June 1, 2013 Gold Stream Amended and Restated Agreements Mt. Milligan	Mar. 31, 2013 Payment, September 1, 2013 Gold Stream Amended and Restated Agreements Mt. Milligan
Arrangement disclosures
Percentage of payable gold to be sold per arrangement (percent)				52.25%
Total receipts on gold purchased				$ 781.5
Specified purchase price per ounce (usd per ounce)				435
Gold Stream deferred revenue	731.6		669.6		731.6
Future scheduled quarterly receipts on gold purchased									62.0	37.0	12.9
Proceeds from Gold	62.0	45.0				305.0	138.1	226.5
Future scheduled receipts on gold purchased					$ 49.9
Period for which cash deposit can be used for price differential (in years)					50 years