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Fair Value Measurements (Financial Instruments Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Trading Securities at Fair Value | $ 84.5 | $ 98.6
Investments, Fair Value Disclosure | 51.9 |
Fair Value, Measurements, Recurring [Member] |  |
Investments, Fair Value Disclosure | 96.0 | 115.0
Total Assets at Fair Value | 96.0 | 115.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Investments, Fair Value Disclosure | 96.0 | 115.0
Total Assets at Fair Value | 96.0 | 115.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] |  |
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] |  |
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] |  |
Marketable Securities | 11.3 | 16.2
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Marketable Securities | 11.3 | 16.2
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] |  |
Marketable Securities | 0.0 | 0.0
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member] |  |
Marketable Securities | 0.0 | 0.0
Mutual Fund [Member] | Fair Value, Measurements, Recurring [Member] |  |
Trading Securities at Fair Value | 84.5 | 98.6
Mutual Fund [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Trading Securities at Fair Value | 84.5 | 98.6
Mutual Fund [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] |  |
Trading Securities at Fair Value | 0.0 | 0.0
Mutual Fund [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member] |  |
Trading Securities at Fair Value | 0.0 | 0.0
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Marketable Securities | 0.2 | 0.2
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Marketable Securities | 0.2 | 0.2
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] |  |
Marketable Securities | 0.0 | 0.0
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member] |  |
Marketable Securities | $ 0.0 | $ 0.0

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