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3. Fair Value Measurements Short-term Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 418.1 | $ 435.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 884.8 | 681.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.5) | (1.8)
Estimated Fair Value | [1] | 1,301.4 | 1,115.6
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 185.7 | 179.4
Interest-bearing Deposits [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value |  | 0.7 | 3.6
Municipal Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 15.0 | 15.4
Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 55.6 | 62.5
Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 973.4 | 767.8
US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 67.6 | 82.5
Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 3.4 | 4.4
Short-term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value |  | 371.2 | 383.2
Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 185.9 | 179.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.3 | 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.5) | (0.5)
Estimated Fair Value |  | 185.7 | 179.4
Short-term Investments [Member] | Interest-bearing Deposits [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 0.7 | 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
Estimated Fair Value |  | 0.7 | 3.6
Short-term Investments [Member] | Municipal Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 15.1 | 15.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.1) | (0.1)
Estimated Fair Value |  | 15.0 | 15.4
Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 55.6 | 62.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.2) | (0.1)
Estimated Fair Value |  | 55.4 | 62.2
Short-term Investments [Member] | Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 34.4 | 32.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 9.0 | 3.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | (0.4)
Estimated Fair Value |  | 43.4 | 35.7
Short-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 363.4 | 380.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 9.3 | 4.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.5) | (1.8)
Estimated Fair Value |  | 371.2 | 383.2
Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 68.3 | 83.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.7) | (0.7)
Estimated Fair Value |  | 67.6 | 82.5
Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 3.4 | 4.4
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
Estimated Fair Value |  | 3.4 | 4.4
Other Long-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 0.2 | 0.3
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
Estimated Fair Value |  | 0.2 | 0.3
Other Long-term Investments [Member] | Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 54.5 | 54.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 875.5 | 677.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | 930.0 | 732.1
Other Long-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 54.7 | 54.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 875.5 | 677.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | $ 930.2 | $ 732.4
[1] | Available-for-sale investments are included in the following accounts in the Consolidated Balance Sheets (in millions):
| December 31, 2017 |  | December 31, 2016
Short-term investments | $ | 371.2 |  |  | $ | 383.2 |
Other investments | 930.2 |  |  | 732.4 |
Total | $ | 1,301.4 |  |  | $ | 1,115.6 |

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