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3. Available-for-Sale Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 331.1 | $ 334.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 521.2 | 251.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.2) | (0.6)
Estimated Fair Value | [1] | 851.1 | 585.9
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 142.0 | 139.9
Foreign Brokered Certificates of Deposit [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] |  | 5.2
Municipal obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 5.7 | 6.5
Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 45.7 | 48.4
Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 603.6 | 334.4
US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 50.3 | 47.5
Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 3.8 | 4.0
Other Long-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 0.3 | 0.4
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 |  | 0.3 | 0.4
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 |  | 517.6 | 246.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | 572.1 | 301.1
Other Long-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 54.8 | 54.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 517.6 | 246.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | 572.4 | 301.5
Short-term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value |  | 278.7 | 284.4
Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 142.0 | 139.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.3 | 0.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.3) | (0.2)
Estimated Fair Value |  | 142.0 | 139.9
Short-term Investments [Member] | Foreign Brokered Certificates of Deposit [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  |  | 5.2
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 |  |  | 5.2
Short-term Investments [Member] | Municipal obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 5.7 | 6.5
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | 5.7 | 6.5
Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 45.5 | 48.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.0 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.1) | (0.2)
Estimated Fair Value |  | 45.4 | 48.0
Short-term Investments [Member] | Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 29.3 | 29.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 3.0 | 4.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.8) | (0.2)
Estimated Fair Value |  | 31.5 | 33.3
Short-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 276.3 | 280.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 3.6 | 5.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.2) | (0.6)
Estimated Fair Value |  | 278.7 | 284.4
Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 50.0 | 47.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.3 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | 50.3 | 47.5
Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 3.8 | 4.0
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 | $ 4.0
[1] | Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): September 30, 2015 December 31, 2014Short-term investments$278.7 $284.4Other investments572.4 301.5Total$851.1 $585.9

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=51813488&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=27724398&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=49167202&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=27724398&loc=d3e27161-111563 + Details
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