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Financial Instruments and Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2026
Fair Value Disclosures [Abstract]  
Summary Of Carrying Values And Fair Values Of Fixed Rate Debt A summary of the aggregate carrying values and fair values of our senior unsecured notes is as follows:
March 31,
2026		December 31,
2025
Carrying value$3,426.9 $3,425.6 
Fair value$3,320.9 $3,357.7 
Gains (losses) recognized related to equity investments
Three Months Ended March 31,
20262025
Net gains (losses) recognized during the period on equity securities
$54.0 $(11.5)
Less: Net gains recognized during the period on equity securities sold/exchanged during the period
1.5 — 
Unrealized gains (losses) recognized during the reporting period on equity securities still held at the reporting date
$52.5 $(11.5)
Nonfinancial Assets Measured and Recorded At Fair Value On A Nonrecurring Basis
The following table presents nonfinancial assets measured and recorded at fair value on a nonrecurring basis during the three months ended March 31, 2026 and 2025:
20262025
DescriptionFair Value
Measurements Using Significant
Unobservable Inputs
(Level 3)		Gain/(Loss)Fair Value
Measurements Using Significant
Unobservable Inputs
(Level 3)		Gain/(Loss)
Long-lived assets held and used$— $(5.2)$— $(0.2)