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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 | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Equity investments with readily determinable fair values | $ 9.9 |  | $ 20.0
Net losses recognized during the period on equity securities | (10.1) | $ (8.5) |
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 | (10.1) | (8.5) |
Carrying value | Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fixed rate debt | 3,280.0 |  | 2,782.1
Fair value | Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fixed rate debt | 3,192.9 |  | 2,578.6
Fair Value, Nonrecurring [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Equity securities without readily determinable fair value, downward adjustment | 0.0 | 8.4 |
Equity investment without readily determinable fair value, cumulative downward adjustment | 8.4 |  |
Equity investment without readily determinable fair value, cumulative upward adjustment | 3.4 |  |
Fair Value, Nonrecurring [Member] | Level 3 |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Equity investment without readily determinable fair value | 0.0 | $ 48.3 |
Fair Value, Nonrecurring [Member] | Carrying value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Equity investment without readily determinable fair value | $ 50.5 |  | $ 49.8

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