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Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
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 | $ 6.0 | $ 6.0
Fair Value, Measurements, Recurring |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |
Available for sale securities | 5.0 | 6.0 |
Trading securities | 4.0 | 3.0 |
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 | 3.0 |
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 | 6.0 |
Trading securities | $ 0.0 | $ 0.0 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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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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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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