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Financial Instruments and Fair Value Measurements (Summary Of Carrying Values and Fair Values Of Fixed Rate Debt) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Equity investments with readily determinable fair values | $ 8.5 |  | $ 20.0
Net losses recognized during the period on equity securities | (11.5) | $ (0.4) |
Less: Net gains (losses) recognized during the period on equity securities sold during the period | 0.0 | 0.0 |
Unrealized losses recognized during the reporting period on equity securities still held at the reporting date | (11.5) | $ (0.4) |
Carrying value | Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fixed rate debt | 3,278.2 |  | 2,782.1
Fair value | Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fixed rate debt | 3,103.3 |  | 2,578.6
Nonrecurring Basis |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Equity investment without readily determinable fair value, cumulative downward adjustment | 8.4 |  |
Equity investment without readily determinable fair value, cumulative upward adjustment | 3.4 |  |
Nonrecurring Basis | Carrying value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Equity investment without readily determinable fair value | $ 49.8 |  | $ 49.8

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