Prepaid Common Stock Purchase Contracts, Settlement in Period

No definition available.

Name:	tc_PrepaidCommonStockPurchaseContractsSettlementInPeriod
Namespace Prefix:	tc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents tangible equity unit equity component settlement rate on or after November 11,2012 per unit.

+ References

No definition available.

+ Details

Name:	tc_TangibleEquityUnitEquityComponentAfterNovember102012SettlementRatePerUnit
Namespace Prefix:	tc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents tangible equity unit equity component percentage of minimum settlement rate.

+ References

No definition available.

+ Details

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

- Definition

Represents tangible equity unit equity component settlement rate prior to November 10,2012 per unit.

+ References

No definition available.

+ Details

Name:	tc_TangibleEquityUnitEquityComponentPriorToNovember102012SettlementRatePerUnit
Namespace Prefix:	tc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Total units issued during the year due to the sale of units.

+ References

No definition available.

+ Details

Name:	tc_TangibleEquityUnitsNumberOfUnitsIssued
Namespace Prefix:	tc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

This element represents the unit price per tangible equity unit.

+ References

No definition available.

+ Details

Name:	tc_TangibleEquityUnitsUnitPrice
Namespace Prefix:	tc_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

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

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

+ Details

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

+ References

No definition available.

+ Details

Name:	us-gaap_DebtIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of cash paid for interest during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 29

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585

+ Details

Name:	us-gaap_InterestPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

Name:	us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sum of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6787-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 340

-SubTopic 10

-Section 05

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6386993&loc=d3e5879-108316

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Section A

-Paragraph 4

-Chapter 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Assets

-URI http://asc.fasb.org/extlink&oid=6509628

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765

+ Details

Name:	us-gaap_PrepaidExpenseCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Tangible Equity Units (tMEDS) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended			3 Months Ended		3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Tangible Equity Units	May 11, 2012 Tangible Equity Units	Mar. 31, 2013 Equity Component	Mar. 31, 2013 Estimate of Fair Value	Dec. 31, 2012 Estimate of Fair Value	Mar. 31, 2013 Estimate of Fair Value tMEDS Tangible Equity Units	Dec. 31, 2012 Estimate of Fair Value tMEDS Tangible Equity Units
Tangible Equity Units (tMEDS)
Units issued (unit)					8,800,000
Unit price (usd per share)					$ 25
Prepaid expense				$ 0.9
Cash interest paid	7.9	0.2		0.9
Debt issuance cost				0.9
Purchase contracts settled (usd per contract)						$ 4.3562
Minimum settlement rate, purchase contracts (percent)						95.00%
Settlement rate on or after November 11,2012 (usd per contract)						$ 4.5855
Settlement of prepaid common stock purchase contracts (in shares)						360,000
Common stock, shares issued (shares)	170,671,457		168,726,984			1,650,780
Fair value disclosure							$ 885.4	$ 870.2	$ 21.3	$ 27.8