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3. Fair Value Measurements Short-term Investments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 327.2 |  | $ 510.4 |
Unrealized Gains | 244.6 |  | 165.9 |
Unrealized Losses | (0.9) |  | (0.6) |
Estimated Fair Value | 570.9 |  | 675.7 |
Short-term Investments [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 132.6 |  | 239.3 |
Unrealized Gains | 0.3 |  | 1.4 |
Unrealized Losses | (0.4) |  | (0.1) |
Estimated Fair Value | 132.5 |  | 240.6 |
Short-term Investments [Member] | Foreign Brokered Certificates of Deposit [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 8.9 |  | 0.4 |
Unrealized Gains | 0 |  | 0 |
Unrealized Losses | 0 |  | 0 |
Estimated Fair Value | 8.9 |  | 0.4 |
Short-term Investments [Member] | Municipal Obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 11.1 |  | 12.0 |
Unrealized Gains | 0 |  | 0.1 |
Unrealized Losses | (0.1) |  | 0 |
Estimated Fair Value | 11.0 |  | 12.1 |
Short-term Investments [Member] | Asset-backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 48.4 |  | 81.6 |
Unrealized Gains | 0.1 |  | 0.4 |
Unrealized Losses | (0.2) |  | (0.1) |
Estimated Fair Value | 48.3 |  | 81.9 |
Short-term Investments [Member] | Marketable Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 26.6 |  | 24.1 |
Unrealized Gains | 5.4 |  | 0.7 |
Unrealized Losses | 0 |  | (0.2) |
Estimated Fair Value | 32.0 |  | 24.6 |
Short-term Investments [Member] | Available-for-sale Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 272.3 |  | 455.3 |
Unrealized Gains | 5.9 |  | 2.9 |
Unrealized Losses | (0.8) |  | (0.5) |
Estimated Fair Value | 277.4 |  | 457.7 |
Short-term Investments [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 39.1 |  | 92.5 |
Unrealized Gains | 0.1 |  | 0.3 |
Unrealized Losses | (0.1) |  | (0.1) |
Estimated Fair Value | 39.1 |  | 92.7 |
Short-term Investments [Member] | Foreign Government Obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 5.6 |  | 5.4 |
Unrealized Gains | 0 |  | 0 |
Unrealized Losses | 0 |  | 0 |
Estimated Fair Value | 5.6 |  | 5.4 |
Other Long-term Investments [Member] | Asset-backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 0.4 |  | 0.4 |
Unrealized Gains | 0 |  | 0 |
Unrealized Losses | (0.1) |  | (0.1) |
Estimated Fair Value | 0.3 |  | 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 |
Unrealized Gains | 238.7 |  | 163.0 |
Unrealized Losses | 0 |  | 0 |
Estimated Fair Value | 293.2 |  | 217.5 |
Other Long-term Investments [Member] | Available-for-sale Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 54.9 |  | 55.1 |
Unrealized Gains | 238.7 |  | 163.0 |
Unrealized Losses | (0.1) |  | (0.1) |
Estimated Fair Value | 293.5 |  | 218.0 |
Other Long-term Investments [Member] | Foreign Government Obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost |  |  | 0.2 |
Unrealized Gains |  |  | 0 |
Unrealized Losses |  |  | 0 |
Estimated Fair Value |  |  | 0.2 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 325.2 | [1] | 242.1 | [1]
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 0 | [1] | 0 | [1]
Fair Value, Inputs, Level 1 [Member] | Foreign Brokered Certificates of Deposit [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 0 | [1] | 0 | [1]
Fair Value, Inputs, Level 1 [Member] | Municipal Obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 0 | [1] | 0 | [1]
Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 0 | [1] | 0 | [1]
Fair Value, Inputs, Level 1 [Member] | Marketable Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 325.2 | [1] | 242.1 | [1]
Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | 0 | [1] | 0 | [1]
Fair Value, Inputs, Level 1 [Member] | Foreign Government Obligations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Estimated Fair Value | $ 0 | [1] | $ 0 | [1]
[1] | Available-for-sale investments are included in the following accounts in the Consolidated Balance Sheets (in millions): December 31, 2013 December 31, 2012 Short-term investments$277.4 $457.7Other investments293.5 218.0Total$570.9 $675.7

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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 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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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + 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 of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + 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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