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3. Fair Value Measurements Available-for-Sale Investments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 400.9 |
Debt Securities, Available-for-sale | 402.9 |
Fair Value, Recurring [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale | 402.9 | $ 373.2
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale | 204.5 | 215.0
Fair Value, Recurring [Member] | Municipal Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale | 11.6 | 11.0
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale | 72.9 | 63.3
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale | 106.1 | 80.3
Fair Value, Recurring [Member] | Foreign Government Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale | 4.7 | 3.6
Fair Value, Recurring [Member] | Foreign Government Debt [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale | 3.1 |
Fair Value, Recurring [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 400.9 | 375.5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2.4 | 0.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (0.4) | (2.6)
Debt Securities, Available-for-sale | 402.9 | 373.2
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale | 402.8 | 373.0
Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 203.2 | 216.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1.4 | 0.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (0.1) | (1.3)
Debt Securities, Available-for-sale | 204.5 | 215.0
Fair Value, Recurring [Member] | Short-term Investments [Member] | Municipal Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 11.5 | 11.1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.1 | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.0 | (0.1)
Debt Securities, Available-for-sale | 11.6 | 11.0
Fair Value, Recurring [Member] | Short-term Investments [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 72.7 | 63.5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.2 | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (0.1) | (0.4)
Debt Securities, Available-for-sale | 72.8 | 63.1
Fair Value, Recurring [Member] | Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 105.6 | 80.9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.7 | 0.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (0.2) | (0.8)
Debt Securities, Available-for-sale | 106.1 | 80.3
Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 4.7 | 3.6
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Debt Securities, Available-for-sale | 4.7 | 3.6
Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Debt [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3.1 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.0 |
Debt Securities, Available-for-sale | 3.1 |
Fair Value, Recurring [Member] | Short-term Investments [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 400.8 | 375.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2.4 | 0.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (0.4) | (2.6)
Debt Securities, Available-for-sale | 402.8 | 373.0
Fair Value, Recurring [Member] | Other Long-term Investments [Member] | Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 0.1 | 0.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Debt Securities, Available-for-sale | 0.1 | 0.2
Fair Value, Recurring [Member] | Other Long-term Investments [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 0.1 | 0.2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.0 | 0.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.0 | 0.0
Debt Securities, Available-for-sale | $ 0.1 | $ 0.2

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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=118939692&loc=d3e27161-111563 + Details
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