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Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 5.0 | $ 0.0 | $ 6.0
Assets, Fair Value Disclosure [Abstract] |  |  |
Available for sale securities | 5.0 |  |
Par value | 19.0 |  |
Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available for sale securities | 5.0 | 0.0 |
Trading securities | 4.0 | 5.0 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member] |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available for sale securities | 0.0 | 0.0 |
Trading securities | 4.0 | 5.0 |
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available for sale securities | 0.0 | 0.0 |
Trading securities | 0.0 | 0.0 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available for sale securities | 5.0 | 0.0 |
Trading securities | $ 0.0 | $ 0.0 |

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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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