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Fair Value Measurements (Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) - Fair Value, Recurring [Member] $ in Millions | Sep. 30, 2025 USD ($)
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | $ 123.2
Total Assets at Fair Value | 123.2
Corporate Debt Securities [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 7.7
Mutual Funds [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Trading Securities at Fair Value | 115.3
Equity Securities [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 0.2
Fair Value, Inputs, Level 1 [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 123.2
Total Assets at Fair Value | 123.2
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 7.7
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Trading Securities at Fair Value | 115.3
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 0.2
Fair Value, Inputs, Level 2 [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 0.0
Total Assets at Fair Value | 0.0
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 0.0
Fair Value, Inputs, Level 2 [Member] | Mutual Funds [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Trading Securities at Fair Value | 0.0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 0.0
Fair Value, Inputs, Level 3 [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 0.0
Total Assets at Fair Value | 0.0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 0.0
Fair Value, Inputs, Level 3 [Member] | Mutual Funds [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Trading Securities at Fair Value | 0.0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | $ 0.0

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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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