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2. Available-for-Sale Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 315.1 | $ 418.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 | 884.8
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (2.9) | (1.5)
Estimated Fair Value | [1] | 312.3 | 1,301.4
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 172.9 | 185.7
Brokered certificates of deposit [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] |  | 0.7
Municipal obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 15.2 | 15.0
Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 55.2 | 55.6
Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] |  | 973.4
US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 65.2 | 67.6
Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 3.8 | 3.4
Other Long-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 0.2 | 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
Estimated Fair Value |  | 0.2 | 0.2
Other Long-term Investments [Member] | Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  |  | 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
Estimated Fair Value |  |  | 930.0
Other Long-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 0.2 | 54.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 875.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | 0.2 | 930.2
Short-term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value |  | 312.1 | 371.2
Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 174.1 | 185.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 | 0.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.3) | (0.5)
Estimated Fair Value |  | 172.9 | 185.7
Short-term Investments [Member] | Brokered certificates of deposit [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  |  | 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
Estimated Fair Value |  |  | 0.7
Short-term Investments [Member] | Municipal obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 15.3 | 15.1
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 |  | 15.2 | 15.0
Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 55.4 | 55.6
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.4) | (0.2)
Estimated Fair Value |  | 55.0 | 55.4
Short-term Investments [Member] | Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  |  | 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
Estimated Fair Value |  |  | 43.4
Short-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 314.9 | 363.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 | 9.3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (2.9) | (1.5)
Estimated Fair Value |  | 312.1 | 371.2
Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 66.3 | 68.3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.1) | (0.7)
Estimated Fair Value |  | 65.2 | 67.6
Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 3.8 | 3.4
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 |  | $ 3.8 | $ 3.4
[1] | Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions):
| March 31, 2018 |  | December 31, 2017
Short-term investments | $ | 312.1 |  |  | $ | 371.2 |
Other investments | 0.2 |  |  | 930.2 |
Total | $ | 312.3 |  |  | $ | 1,301.4 |

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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