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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2011
Fair Value Measurements [Abstract] |
Financial Assets And Liabilities Measured At Fair Value |
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | December 31, 2011 |  |  | December 31, 2010 |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan investments |  | $ | 41.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 41.0 |  |  | $ | 46.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 46.7 |
Available-for-sale investment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5.0 |  |  |  | — |  |  |  | — |  |  |  | 5.0 |
Derivative financial instruments |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative financial instruments |  | $ | — |  |  | $ | 16.6 |  |  | $ | — |  |  | $ | 16.6 |  |  | $ | — |  |  | $ | 36.9 |  |  | $ | — |  |  | $ | 36.9 |
Fair Value Of Notes Receivable And Notes Payable |
|  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |  |  |  | September 30, |
|  | December 31, 2011 |  |  | December 31, 2010 |
(in millions) |  | Carrying Value |  |  | Estimated Fair Value |  |  | Carrying Value |  |  | Estimated Fair Value |
Notes receivable – affiliates |  | $ | — |  |  | $ | — |  |  | $ | 3.2 |  |  | $ | 3.2 |
Fixed rate notes payable (1) |  |  | 2,186.6 |  |  |  | 2,304.4 |  |  |  | 2,333.5 |  |  |  | 2,386.0 |
Floating rate notes payable |  |  | 245.5 |  |  |  | 233.6 |  |  |  | 230.3 |  |  |  | 212.7 |
(1) | December 31, 2010 includes a $500 million term loan entered into in 2007, and a $16.6 million construction loan entered into in 2008 which are effectively fixed by the use of interest rate swaps but evaluated for estimated fair value at the floating rate. The $500 million term loan was repaid in June 2011. The $16.6 million construction loan interest rate swap matured and was not extended in conjunction with the one-year extension of the loan in July 2011.

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- Definition Fair Value Of Notes Receivable And Notes Payable. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 820 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258 + Details
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