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3. Available-for-Sale Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 434.1 | $ 435.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 886.5 | 681.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.8) | (1.8)
Estimated Fair Value | [1] | 1,319.8 | 1,115.6
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 200.6 | 179.4
Brokered certificates of deposit [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] |  | 3.6
Municipal obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 14.3 | 15.4
Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 57.8 | 62.5
Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 973.2 | 767.8
US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 70.9 | 82.5
Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 3.0 | 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 |  | 877.6 | 677.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | 932.1 | 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 |  | 877.6 | 677.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | 932.3 | 732.4
Short-term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value |  | 387.5 | 383.2
Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 200.3 | 179.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.5 | 0.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.2) | (0.5)
Estimated Fair Value |  | 200.6 | 179.4
Short-term Investments [Member] | Brokered certificates of deposit [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 |  | 14.4 | 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 |  | 14.3 | 15.4
Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 57.7 | 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 |  | (0.1) | (0.1)
Estimated Fair Value |  | 57.6 | 62.2
Short-term Investments [Member] | Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 32.8 | 32.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 8.3 | 3.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | (0.4)
Estimated Fair Value |  | 41.1 | 35.7
Short-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 379.4 | 380.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 8.9 | 4.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.8) | (1.8)
Estimated Fair Value |  | 387.5 | 383.2
Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 71.2 | 83.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.4) | (0.7)
Estimated Fair Value |  | 70.9 | 82.5
Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 3.0 | 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 |  | $ 3.0 | $ 4.4
[1] | Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions):
| September 30, 2017 |  | December 31, 2016
Short-term investments | $ | 387.5 |  |  | $ | 383.2 |
Other investments | 932.3 |  |  | 732.4 |
Total | $ | 1,319.8 |  |  | $ | 1,115.6 |

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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