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Fair Value Measurements (Financial Instruments Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading Securities at Fair Value | $ 104.2 | $ 101.3
Investments, Fair Value Disclosure | 11.6 |
Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 113.2 | 111.7
Total Assets at Fair Value | 113.2 | 111.7
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 113.2 | 111.7
Total Assets at Fair Value | 113.2 | 111.7
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Total Assets at Fair Value | 0.0 | 0.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments, Fair Value Disclosure | 0.0 | 0.0
Total Assets at Fair Value | 0.0 | 0.0
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable Securities | 8.8 | 10.2
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable Securities | 8.8 | 10.2
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable Securities | 0.0 | 0.0
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable Securities | 0.0 | 0.0
Mutual Fund [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading Securities at Fair Value | 104.2 | 101.3
Mutual Fund [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading Securities at Fair Value | 104.2 | 101.3
Mutual Fund [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading Securities at Fair Value | 0.0 | 0.0
Mutual Fund [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Trading Securities at Fair Value | 0.0 |
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable Securities | 0.2 | 0.2
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable Securities | 0.2 | 0.2
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable Securities | 0.0 | 0.0
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member] |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Marketable Securities | $ 0.0 | $ 0.0

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