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Financial Instruments and Risk Management (Schedule of Available-for-sale Securities Reconciliation) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 38.1 | $ 37.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0.1 | 1.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Fair Value | 38.2 | 39.1
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 38.1 | 37.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0.1 | 1.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Fair Value | $ 38.2 | $ 39.1

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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