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3. Available-for-Sale Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | $ 396.5 | $ 382.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 570.1 | 577.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.0) | (1.6)
Estimated Fair Value | [1] | 965.6 | 957.6
Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 149.8 | 156.9
Municipal obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 10.1 | 6.4
Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 68.6 | 54.8
Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 653.6 | 660.1
US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 78.5 | 74.8
Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value | [1] | 5.0 | 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 |  | 565.8 | 574.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | 620.3 | 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 |  | 565.8 | 574.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | (0.1)
Estimated Fair Value |  | 620.6 | 628.9
Short-term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Estimated Fair Value |  | 345.0 | 328.7
Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 149.3 | 157.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.7 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.2) | (0.4)
Estimated Fair Value |  | 149.8 | 156.9
Short-term Investments [Member] | Municipal obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 10.0 | 6.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.1 | 0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | 0.0
Estimated Fair Value |  | 10.1 | 6.4
Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 68.4 | 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 |  | (0.2) | (0.2)
Estimated Fair Value |  | 68.3 | 54.6
Short-term Investments [Member] | Marketable Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 31.2 | 29.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 2.7 | 2.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (0.6) | (0.7)
Estimated Fair Value |  | 33.3 | 31.4
Short-term Investments [Member] | Available-for-sale Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 341.7 | 327.3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 4.3 | 2.9
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | (1.0) | (1.5)
Estimated Fair Value |  | 345.0 | 328.7
Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 77.8 | 74.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  | 0.7 | 0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  | 0.0 | (0.2)
Estimated Fair Value |  | 78.5 | 74.8
Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  | 5.0 | 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 |  | $ 5.0 | $ 4.6
[1] | Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): March 31, 2016 December 31, 2015Short-term investments$345.0 $328.7Other investments620.6 628.9Total$965.6 $957.6

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=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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- Definition Amount before tax of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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