Derivative Instruments (Details 2) (USD $) In Millions	6 Months Ended
Jun. 30, 2011
Derivative Instruments (Textuals) [Abstract]
Additional interest expense expected to be recognized	$ 6.3
Commodity Contract [Member]
Derivative Instruments (Textuals) [Abstract]
Valuation of derivative instrument as asset	0.4
Valuation of derivative instrument of income in AOCL	0.3
Interest Rate Locks, 2005 to 2006 [Member]
Derivative Instruments (Textuals) [Abstract]
Interest rate swap, notional amount	200.0
Interest rate swaps being accounted for as cash flow hedges	4.5
Interest Rate Locks, 2006 to 2007 [Member]
Derivative Instruments (Textuals) [Abstract]
Interest rate swap, notional amount	370.0
Interest rate swaps being accounted for as cash flow hedges	(24.5)
TILC warehouse [Member]
Derivative Instruments (Textuals) [Abstract]
Interest rate swap, notional amount	$ 200.0

Additional interest expense expected to be recognized.

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- Definition

Derivative Instruments Textuals.

+ Details

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FIN39-1
-Paragraph 10A, 10B

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 4, 17

+ Details

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b
-Clause 2

+ Details

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- Definition

Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

+ Details

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- Definition

Amount of unrealized gain (loss) related to the increase (decrease) in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 46

+ Details

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