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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, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Equity investments with readily determinable fair values | $ 13.3 |  | $ 15.4
Equity investment without readily determinable fair value | 56.7 |  | 56.7
Net losses recognized during the period on equity securities | (2.3) | $ (0.1) |
Less: Net 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 | (2.3) | $ (0.1) |
Carrying value | Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fixed rate debt | 3,227.1 |  | 3,224.0
Fair value | Senior Notes |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Fixed rate debt | 2,817.8 |  | $ 2,803.6
Nonrecurring Basis |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investment in equity securities without readily determinable fair values, cumulative upward adjustment | $ 3.4 |  |

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-4 + Details
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