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Fair Value Measurements (Financial Instruments Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Trading Securities at Fair Value | $ 98.6 | $ 82.6
Investments, Fair Value Disclosure | 41.4 |
Fair Value, Measurements, Recurring [Member] |  |
Investments, Fair Value Disclosure | 115.0 | 100.9
Total Assets at Fair Value | 115.0 | 100.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Investments, Fair Value Disclosure | 115.0 | 100.6
Total Assets at Fair Value | 115.0 | 100.6
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] |  |
Investments, Fair Value Disclosure | 0.0 | 0.3
Total Assets at Fair Value | 0.0 | 0.3
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 | 16.2 | 17.9
Corporate Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Marketable Securities | 16.2 | 17.9
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 | 98.6 | 82.6
Mutual Fund [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Trading Securities at Fair Value | 98.6 | 82.6
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 | 0.1
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Marketable Securities | 0.2 | 0.1
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
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |
Marketable Securities |  | 0.3
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 1 [Member] |  |
Marketable Securities |  | 0.0
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 2 [Member] |  |
Marketable Securities |  | 0.3
Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, level 3 [Member] |  |
Marketable Securities |  | $ 0.0

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