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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Our financial assets and liabilities that are measured at fair value on a recurring basis are as follows (in millions):
  Fair Value Measurements at Reporting Date Using
As of December 31, 2024Fair ValueQuoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)
Significant Unobservable Inputs
(Level 3)
Valuation Technique (1)
Equity securities$130.9 $4.2 $126.7 $— M
Redeemable noncontrolling interests56.5 — — 56.5 I
As of December 31, 2023     
Equity securities$126.2 $4.0 $122.2 $— M
Redeemable noncontrolling interests42.0 — — 42.0 I
(1)The two valuation techniques are: market approach (M) and income approach (I).
Schedule of Carrying Amounts and Estimated Fair Values, Financial Instruments The carrying amounts and estimated fair values for our other financial instruments are presented in the following table (in millions):
 As of December 31, 2024As of December 31, 2023
 Carrying AmountEstimated Fair ValueCarrying AmountEstimated Fair Value
Long-term debt:    
Advances under revolving credit facility$20.0 $20.0 $— $— 
5.75% Senior Notes due 2025
99.8 99.7 348.5 349.3 
4.50% Senior Notes due 2028
788.4 772.3 785.0 763.6 
4.75% Senior Notes due 2030
784.2 759.0 781.5 755.0 
4.625% Senior Notes due 2031
392.5 369.9 391.5 369.4 
Other notes payable94.5 94.5 66.0 66.0 
Financial commitments:    
Letters of credit— 36.3 — 31.9