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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2021
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 June 30, 2021 and December 31, 2020 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
 June 30, 2021December 31, 2020
(in millions)Quoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)TotalQuoted 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)
$132.9 $— $— $132.9 $129.8 $— $— $129.8 
(1)Approximately $9.4 million and $37.8 million of participant cash was withdrawn from our deferred compensation plan investments during the six months ended June 30, 2021 and the year ended December 31, 2020, respectively.
Fair Value Of Notes Payable The following table presents the carrying and estimated fair values of our notes payable at June 30, 2021 and December 31, 2020, in accordance with the policies discussed in Note 2, "Summary of Significant Accounting Policies and Recent Accounting Pronouncements."
 June 30, 2021December 31, 2020
(in millions)Carrying
Value		Estimated
Fair Value		Carrying
Value		Estimated
Fair Value
Fixed rate notes payable$3,128.7 $3,335.3 $3,126.9 $3,519.9 
Floating rate notes payable39.8 40.1 39.7 40.0