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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Entity Information [Line Items] |  |  |
Concentration Risk, Percentage | 48.20% | 49.00% | 51.00%
Interest Costs Incurred, Capitalized | $ 0.1 | $ 0 | $ 0.1
Amortization of Financing Costs and Discounts | 2.6 | 3.1 | 3.0
Unrealized gain (losses) on securities, net of reversals | (6.3) | (4.9) | 11.8
Deferred Income Tax Expense (Benefit) | (28.3) | (8.7) | (18.4)
Notes payable | 7.9 | 0 |
Gains (Losses) on Extinguishment of Debt | 0 | 0 | (20.7)
Maximum [Member] |  |  |
Entity Information [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 50.00% |  |
Percentage Used To Determine Noncontrolling Interest Presentation | 1.00 |  |
Minimum [Member] |  |  |
Entity Information [Line Items] |  |  |
Equity Method Investment, Ownership Percentage | 20.00% |  |
Percentage Used To Determine Noncontrolling Interest Presentation | 0.50 |  |
Home Depot [Member] |  |  |
Entity Information [Line Items] |  |  |
Concentration Risk, Percentage |  | 10.90% | 10.90%
Taiga [Member] |  |  |
Entity Information [Line Items] |  |  |
Concentration Risk, Percentage |  |  | 10.10%
Deferred Loss on Early Extinguishment of Debt [Member] |  |  |
Entity Information [Line Items] |  |  |
Gains (Losses) on Extinguishment of Debt |  |  | 3.8
Non Recourse Notes Payable 2018 [Member] |  |  |
Entity Information [Line Items] |  |  |
Notes payable | 368.7 | 368.7 |
Swap [Member] |  |  |
Entity Information [Line Items] |  |  |
Unrealized gain (losses) on securities, net of reversals | (1.4) | (0.7) |
Deferred Income Tax Expense (Benefit) | $ (0.3) |  |

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- Definition Appreciation or loss in value (before reclassification adjustment) of the total of unsold securities during the period being reported on, net of tax. Reclassification adjustments include: (1) the unrealized holding gain (loss), net of tax, at the date of the transfer for a debt security from the held-to-maturity category transferred into the available-for-sale category. Also includes the unrealized gain (loss) at the date of transfer for a debt security from the available-for-sale category transferred into the held-to-maturity category; (2) the unrealized gains (losses) realized upon the sale of securities, after tax; and (3) the unrealized gains (losses) realized upon the write-down of securities, after tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 -Topic 220 -SubTopic 10 -Section 55 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 17, 22 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(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. + Details
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