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3. Available-for-Sale Investments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 327.2 |  | $ 327.2 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 228.0 |  | 244.6 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.5 |  | 0.9 |
Estimated Fair Value | 554.7 |  | 570.9 |
Other Long-term Investments [Member] | Asset-backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 0.4 |  | 0.4 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0.1 |
Estimated Fair Value | 0.4 |  | 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 | 221.8 |  | 238.7 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0 |
Estimated Fair Value | 276.3 |  | 293.2 |
Other Long-term Investments [Member] | Available-for-sale Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 54.9 |  | 54.9 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 221.8 |  | 238.7 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 0.1 |
Estimated Fair Value | 276.7 |  | 293.5 |
Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 132.3 |  | 132.6 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0.4 |  | 0.3 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.1 |  | 0.4 |
Estimated Fair Value | 132.6 |  | 132.5 |
Short-term Investments [Member] | Foreign Brokered Certificates of Deposit [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 5.2 |  | 8.9 |
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 |  | 8.9 |
Short-term Investments [Member] | Municipal obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 7.9 |  | 11.1 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.1 |  | 0.1 |
Estimated Fair Value | 7.8 |  | 11.0 |
Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 49.8 |  | 48.4 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 |  | 0.1 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.1 |  | 0.2 |
Estimated Fair Value | 49.7 |  | 48.3 |
Short-term Investments [Member] | Marketable Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 26.7 |  | 26.6 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 5.7 |  | 5.4 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.1 |  | 0 |
Estimated Fair Value | 32.3 |  | 32.0 |
Short-term Investments [Member] | Available-for-sale Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 272.3 |  | 272.3 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 6.2 |  | 5.9 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.5 |  | 0.8 |
Estimated Fair Value | 278.0 |  | 277.4 |
Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 46.0 |  | 39.1 |
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0.1 |  | 0.1 |
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0.1 |  | 0.1 |
Estimated Fair Value | 46.0 |  | 39.1 |
Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 4.4 |  | 5.6 |
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 | 4.4 |  | 5.6 |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 554.7 | [1] | 570.9 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 132.6 | [1] | 132.5 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Brokered Certificates of Deposit [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 5.2 | [1] | 8.9 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 7.8 | [1] | 11.0 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 50.1 | [1] | 48.6 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Marketable Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 308.6 | [1] | 325.2 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 46.0 | [1] | 39.1 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Government Obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 4.4 | [1] | 5.6 | [1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Short-term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | $ 278.0 |  | $ 277.4 |
[1] | Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): September 30, 2014 December 31, 2013Short-term investments$278.0 $277.4Other investments276.7 293.5Total$554.7 $570.9

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- 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=28360136&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=6871852&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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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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