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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	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity investments with readily determinable fair values	$ 14.3		$ 15.4
Equity investment without readily determinable fair value	56.7		56.7
Net losses recognized during the period on equity securities	(1.3)	$ (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	(1.3)	$ (0.1)
Carrying value | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed rate debt	3,226.0		3,224.0
Fair value | Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fixed rate debt	2,872.2		$ 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

X

- Definition

Amount of 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
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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/2009/role/commonPracticeRef
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117546-209714

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+ References

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