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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Financial Assets And Liabilities Measured At Fair Value | The following table presents information about our financial instruments measured at fair value on a recurring basis as of December 31, 2020 and 2019 using the inputs and fair value hierarchy discussed in Note 2, “Summary of Significant Accounting Policies and Recent Accounting Pronouncements”: Financial Instruments Measured at Fair Value on a Recurring Basis
| December 31, 2020 |  | December 31, 2019
(in millions) | 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
Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan investments (1) | $ | 129.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 129.8 |  |  | $ | 151.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 151.8 |
(1)Approximately $37.8 million and $18.0 million of participant cash was withdrawn from our deferred compensation plan investments during the years ended December 31, 2020 and 2019, respectively.
Fair Value Of Notes Payable | The following table presents the carrying and estimated fair values of our notes payable at December 31, 2020 and 2019, in accordance with the policies discussed in Note 2, "Summary of Significant Accounting Policies and Recent Accounting Pronouncements."
| December 31, 2020 |  | December 31, 2019
(in millions) | Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
Fixed rate notes payable | $ | 3,126.9 |  |  | $ | 3,519.9 |  |  | $ | 2,380.4 |  |  | $ | 2,533.5 |
Floating rate notes payable (1) | 39.7 |  |  | 40.0 |  |  | 143.7 |  |  | 143.8 |
(1)Includes balances outstanding under our unsecured credit facility at December 31, 2019.

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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