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Fair Value Measurements (Financial Instruments Measured At Fair Value On A Recurring Basis) (Details) - Fair Value, Recurring [Member] $ in Millions | Mar. 31, 2022 USD ($)
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | $ 109.6
Total Assets at Fair Value | 109.6
Corporate Debt Securities [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 14.2
Mutual Funds [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Trading Securities at Fair Value | 95.2
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 | 109.6
Total Assets at Fair Value | 109.6
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Marketable Securities | 14.2
Fair Value, Inputs, Level 1 [Member] | Mutual Funds [Member] |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Trading Securities at Fair Value | 95.2
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 probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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