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Financial Instruments and Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Unrealized gains recognized on equity securities
The following is the portion of unrealized gains recognized during the years ended December 31, 2023 and 2022, related to equity securities still held at December 31:
20232022
Net gains recognized during the period on equity securities
$5.2 $2.9 
Less: Net gains recognized during the period on equity securities sold during the period— — 
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date
$5.2 $2.9 
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 at December 31 is as follows:
20232022
Carrying value$3,228.1 $3,224.0 
Fair value$2,979.3 $2,803.6 
Nonfinancial Assets Measured and Recorded At Fair Value On A Nonrecurring Basis
The following table presents assets measured and recorded at fair value on a nonrecurring basis during the years ended December 31, 2023 and 2022:
20232022
DescriptionFair Value Measurements Using Significant Unobservable Inputs (Level 3)Gain/(Loss)Fair Value Measurements Using Significant Unobservable Inputs (Level 3)Gain/(Loss)
Other intangible assets
$— $(2.3)$— $— 
Long-lived assets held and used$— $(2.9)$— $(1.6)