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3. Fair Value Measurements Short-term Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 435.7 | $ 382.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 681.7 | 577.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.8) | (1.6)
Estimated Fair Value | [1] | 1,115.6 | 957.6
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 179.4 | 156.9
Interest-bearing Deposits [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value |  | 3.6 |
Municipal Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 15.4 | 6.4
Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 62.5 | 54.8
Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 767.8 | 660.1
US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 82.5 | 74.8
Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 4.4 | 4.6
Short-term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value |  | 383.2 | 328.7
Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 179.7 | 157.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.2 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.5) | (0.4)
Estimated Fair Value |  | 179.4 | 156.9
Short-term Investments [Member] | Interest-bearing Deposits [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 3.6 |
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 |  | 3.6 |
Short-term Investments [Member] | Municipal Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 15.5 | 6.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.1) | 0.0
Estimated Fair Value |  | 15.4 | 6.4
Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 62.2 | 54.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.1) | (0.2)
Estimated Fair Value |  | 62.2 | 54.6
Short-term Investments [Member] | Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 32.4 | 29.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 3.7 | 2.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.4) | (0.7)
Estimated Fair Value |  | 35.7 | 31.4
Short-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 380.9 | 327.3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 4.1 | 2.9
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.8) | (1.5)
Estimated Fair Value |  | 383.2 | 328.7
Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 83.1 | 74.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.7) | (0.2)
Estimated Fair Value |  | 82.5 | 74.8
Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 4.4 | 4.6
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 |  | 4.4 | 4.6
Other Long-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 0.3 | 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 | (0.1)
Estimated Fair Value |  | 0.3 | 0.2
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 |  | 677.6 | 574.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | 732.1 | 628.7
Other Long-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 54.8 | 54.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 677.6 | 574.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | (0.1)
Estimated Fair Value |  | $ 732.4 | $ 628.9
[1] | Available-for-sale investments are included in the following accounts in the Consolidated Balance Sheets (in millions):
| December 31, 2016 |  | December 31, 2015
Short-term investments | $ | 383.2 |  |  | $ | 328.7 |
Other investments | 732.4 |  |  | 628.9 |
Total | $ | 1,115.6 |  |  | $ | 957.6 |

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