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Fair Value Measurements
 12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements:
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).
There are assets and liabilities that are not required to be measured at fair value on a recurring basis. However, these assets may be recorded at fair value as a result of impairment charges or other adjustments made to the carrying value of the applicable assets. During the years ended December 31, 2024, 2023, and 2022, we did not record any material gains or losses related to these assets.
As discussed in Note 1, Summary of Significant Accounting Policies, “Fair Value Measurements,” the carrying value equals fair value for our financial instruments that are not included in the table below and are classified as current in our consolidated balance sheets. 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 
Fair values for our long-term debt and financial commitments are determined using inputs, including quoted prices in nonactive markets, that are observable either directly or indirectly, or Level 2 inputs within the fair value hierarchy. See Note 1, Summary of Significant Accounting Policies, “Fair Value Measurements” and “Redeemable Noncontrolling Interests.”