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3. Short-term Investments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 330.9		$ 296.4
Unrealized Gains	107.3		70.8
Unrealized Losses	(0.9)		(1.2)
Estimated Fair Value	437.3		366.0
Long Term Investments [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0.5		0.5
Unrealized Gains	0		0
Unrealized Losses	(0.2)		(0.1)
Estimated Fair Value	0.3		0.4
Long Term Investments [Member] | Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	57.5		57.2
Unrealized Gains	106.4		70.0
Unrealized Losses	(0.5)		(0.7)
Estimated Fair Value	163.4		126.5
Long Term Investments [Member] | Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	58.4		58.0
Unrealized Gains	106.4		70.0
Unrealized Losses	(0.7)		(0.8)
Estimated Fair Value	164.1		127.2
Long Term Investments [Member] | Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0.4		0.3
Unrealized Gains	0		0
Unrealized Losses	0		0
Estimated Fair Value	0.4		0.3
Short-term Investments [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	169.7		170.9
Unrealized Gains	0.5		0.1
Unrealized Losses	(0.1)		(0.4)
Estimated Fair Value	170.1		170.6
Short-term Investments [Member] | Brokered Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1.8		1.8
Unrealized Gains	0		0
Unrealized Losses	0		0
Estimated Fair Value	1.8		1.8
Short-term Investments [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3.1		5.0
Unrealized Gains	0		0
Unrealized Losses	0		0
Estimated Fair Value	3.1		5.0
Short-term Investments [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18.4		10.8
Unrealized Gains	0.1		0
Unrealized Losses	0		0
Estimated Fair Value	18.5		10.8
Short-term Investments [Member] | Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11.8		7.7
Unrealized Gains	0.3		0.6
Unrealized Losses	0		0
Estimated Fair Value	12.1		8.3
Short-term Investments [Member] | Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	272.5		238.4
Unrealized Gains	0.9		0.8
Unrealized Losses	(0.2)		(0.4)
Estimated Fair Value	273.2		238.8
Short-term Investments [Member] | US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	58.0		36.8
Unrealized Gains	0		0.1
Unrealized Losses	(0.1)		0
Estimated Fair Value	57.9		36.9
Short-term Investments [Member] | Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9.7		5.4
Unrealized Gains	0		0
Unrealized Losses	0		0
Estimated Fair Value	9.7		5.4
Estimate of Fair Value, Fair Value Disclosure [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	437.3	[1]	366.0	[1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	170.1	[1]	170.6	[1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Brokered Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	1.8	[1]	1.8	[1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	3.1	[1]	5.0	[1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	18.8	[1]	11.2	[1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	175.5	[1]	134.8	[1]
Estimate of Fair Value, Fair Value Disclosure [Member] | US Government Agencies Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	57.9	[1]	36.9	[1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	10.1	[1]	5.7	[1]
Estimate of Fair Value, Fair Value Disclosure [Member] | Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 273.2		$ 238.8
[1] Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): March 31, 2012 December 31, 2011Short-term investments$273.2 $238.8Other assets164.1 127.2Total$437.3 $366.0

X

- 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 FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 7

-Footnote 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

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X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 22

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13, 19

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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