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2. Available-for-Sale Investments (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | $ 373.7 |
Estimated Fair Value |  | 370.7 |
Fair Value, Measurements, Recurring [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | [1] |  | $ 1,301.4
Amortized Cost |  | 373.7 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (3.1) |
Estimated Fair Value | [1] | 370.7 |
Available-for-sale Securities, Amortized Cost Basis |  |  | 418.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 884.8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 1.5
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | [1] |  | 185.7
Estimated Fair Value | [1] | 223.6 |
Fair Value, Measurements, Recurring [Member] | Brokered certificates of deposit [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | [1] |  | 0.7
Fair Value, Measurements, Recurring [Member] | Municipal obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | [1] |  | 15.0
Estimated Fair Value | [1] | 15.6 |
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | [1] |  | 55.6
Estimated Fair Value | [1] | 62.9 |
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | [1] |  | 973.4
Fair Value, Measurements, Recurring [Member] | US Government Sponsored Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | [1] |  | 67.6
Estimated Fair Value | [1] | 66.0 |
Fair Value, Measurements, Recurring [Member] | Foreign Government Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities | [1] |  | 3.4
Estimated Fair Value | [1] | 2.6 |
Fair Value, Measurements, Recurring [Member] | Other Long-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 0.2
Amortized Cost |  | 0.2 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 |
Estimated Fair Value |  | 0.2 |
Available-for-sale Securities, Amortized Cost Basis |  |  | 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0.0
Fair Value, Measurements, Recurring [Member] | Other Long-term Investments [Member] | Marketable Equity Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 930.0
Available-for-sale Securities, Amortized Cost Basis |  |  | 54.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 875.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0.0
Fair Value, Measurements, Recurring [Member] | Other Long-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 930.2
Available-for-sale Securities, Amortized Cost Basis |  |  | 54.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 875.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0.0
Fair Value, Measurements, Recurring [Member] | Other Long-term Investments [Member] | Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 0.2 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 |
Estimated Fair Value |  | 0.2 |
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 371.2
Estimated Fair Value |  | 370.5 |
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 185.7
Amortized Cost |  | 224.9 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.4) |
Estimated Fair Value |  | 223.6 |
Available-for-sale Securities, Amortized Cost Basis |  |  | 185.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0.5
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | Brokered certificates of deposit [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 0.7
Available-for-sale Securities, Amortized Cost Basis |  |  | 0.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0.0
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | Municipal obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 15.0
Amortized Cost |  | 15.7 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.1) |
Estimated Fair Value |  | 15.6 |
Available-for-sale Securities, Amortized Cost Basis |  |  | 15.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0.1
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 55.4
Amortized Cost |  | 63.1 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.4) |
Estimated Fair Value |  | 62.7 |
Available-for-sale Securities, Amortized Cost Basis |  |  | 55.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0.2
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | Marketable Equity Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 43.4
Available-for-sale Securities, Amortized Cost Basis |  |  | 34.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 9.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0.0
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 371.2
Available-for-sale Securities, Amortized Cost Basis |  |  | 363.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 9.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 1.5
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 67.6
Amortized Cost |  | 67.2 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.2) |
Estimated Fair Value |  | 66.0 |
Available-for-sale Securities, Amortized Cost Basis |  |  | 68.3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0.7
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | 3.4
Amortized Cost |  | 2.6 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 |
Estimated Fair Value |  | 2.6 |
Available-for-sale Securities, Amortized Cost Basis |  |  | 3.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | 0.0
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] | Debt Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  | 373.5 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (3.1) |
Estimated Fair Value |  | 370.5 |
Fair Value, Measurements, Recurring [Member] | Other Investments [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Available-for-sale Securities |  |  | $ 930.2
Estimated Fair Value |  | $ 0.2 |
[1] | Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions):
| June 30, 2018 |  | December 31, 2017
Short-term investments | $ | 370.5 |  |  | $ | 371.2 |
Other investments | 0.2 |  |  | 930.2 |
Total | $ | 370.7 |  |  | $ | 1,301.4 |

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