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3. Available-for-Sale Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions		Sep. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 437.6	$ 382.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		760.5	577.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(0.6)	(1.6)
Estimated Fair Value	[1]	1,197.5	957.6
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	185.6	156.9
Brokered certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	3.1
Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	14.8	6.4
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	67.5	54.8
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	844.5	660.1
US Government Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	76.8	74.8
Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	5.2	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		754.5	574.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.0	0.0
Estimated Fair Value		809.0	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		754.5	574.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.0	(0.1)
Estimated Fair Value		809.3	628.9
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value		388.2	328.7
Short-term Investments [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		184.7	157.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		1.0	0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(0.1)	(0.4)
Estimated Fair Value		185.6	156.9
Short-term Investments [Member] | Brokered certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		3.1
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		3.1
Short-term Investments [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		14.7	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		14.8	6.4
Short-term Investments [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		67.1	54.8
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		0.2	0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(0.1)	(0.2)
Estimated Fair Value		67.2	54.6
Short-term Investments [Member] | Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		31.8	29.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		4.0	2.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(0.3)	(0.7)
Estimated Fair Value		35.5	31.4
Short-term Investments [Member] | Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		382.8	327.3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		6.0	2.9
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(0.6)	(1.5)
Estimated Fair Value		388.2	328.7
Short-term Investments [Member] | US Government Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		76.2	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		(0.1)	(0.2)
Estimated Fair Value		76.8	74.8
Short-term Investments [Member] | Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		5.2	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		$ 5.2	$ 4.6
[1] Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): September 30, 2016 December 31, 2015Short-term investments$388.2 $328.7Other investments809.3 628.9Total$1,197.5 $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)
-URI http://asc.fasb.org/extlink&oid=65884222&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
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-URI http://asc.fasb.org/extlink&oid=73527792&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=66010992&loc=d3e26610-111562

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
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+ References

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