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3. Available-for-Sale Investments (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | $ 368.4 |
Debt Securities, Available-for-sale |  | 370.9 |
Fair Value, Recurring [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 370.9 | $ 373.2
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 181.7 | 215.0
Fair Value, Recurring [Member] | Municipal obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 10.7 | 11.0
Fair Value, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 98.5 | 80.3
Fair Value, Recurring [Member] | Foreign Government Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 4.7 | 3.6
Fair Value, Recurring [Member] | Foreign Government Debt [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 3.1 |
Fair Value, Recurring [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 72.2 | 63.3
Fair Value, Recurring [Member] | Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 368.4 | 375.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 2.8 | 0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.3) | (2.6)
Debt Securities, Available-for-sale |  | 370.9 | 373.2
Fair Value, Recurring [Member] | Other Long-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 0.1 | 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.0
Available-for-sale Securities, 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] |  |  |
Amortized Cost |  | 0.1 | 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Debt Securities, Available-for-sale |  | 0.1 | 0.2
Fair Value, Recurring [Member] | Short-term Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | 370.8 | 373.0
Fair Value, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 180.3 | 216.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1.5 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.1) | (1.3)
Debt Securities, Available-for-sale |  | 181.7 | 215.0
Fair Value, Recurring [Member] | Short-term Investments [Member] | Municipal obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 10.6 | 11.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | (0.1)
Debt Securities, Available-for-sale |  | 10.7 | 11.0
Fair Value, Recurring [Member] | Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 97.6 | 80.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 1.0 | 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.1) | (0.8)
Debt Securities, Available-for-sale |  | 98.5 | 80.3
Fair Value, Recurring [Member] | Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 4.7 | 3.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.0
Available-for-sale Securities, 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] |  |  |
Amortized Cost |  | 3.1 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 |
Debt Securities, Available-for-sale |  | 3.1 |
Fair Value, Recurring [Member] | Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 72.0 | 63.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.2 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.1) | (0.4)
Debt Securities, Available-for-sale |  | 72.1 | 63.1
Fair Value, Recurring [Member] | Short-term Investments [Member] | Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 368.3 | 375.3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 2.8 | 0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.3) | (2.6)
Debt Securities, Available-for-sale |  | 370.8 | 373.0
Fair Value, Recurring [Member] | Other Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale | [1] | $ 0.1 | $ 0.2
[1] | Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions):
| September 30, 2019 |  | December 31, 2018
Short-term investments | $ | 370.8 |  |  | $ | 373.0 |
Other investments | 0.1 |  |  | 0.2 |
Total | $ | 370.9 |  |  | $ | 373.2 |

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