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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

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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)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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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

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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-Paragraph 2
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 320
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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