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3. Available-for-Sale Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions		Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 423.5	$ 382.1
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		668.0	577.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(0.7)	(1.6)
Estimated Fair Value	[1]	1,090.8	957.6
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	175.2	156.9
Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	10.6	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]	751.4	660.1
US Government Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	79.4	74.8
Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	6.7	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		663.1	574.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.0	0.0
Estimated Fair Value		717.6	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		663.1	574.2
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.0	(0.1)
Estimated Fair Value		717.9	628.9
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value		372.9	328.7
Short-term Investments [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		174.2	157.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		1.1	0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(0.1)	(0.4)
Estimated Fair Value		175.2	156.9
Short-term Investments [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		10.5	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		10.6	6.4
Short-term Investments [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		67.2	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		(0.1)	(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		31.7	29.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		2.6	2.7
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(0.5)	(0.7)
Estimated Fair Value		33.8	31.4
Short-term Investments [Member] | Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		368.7	327.3
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		4.9	2.9
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		(0.7)	(1.5)
Estimated Fair Value		372.9	328.7
Short-term Investments [Member] | US Government Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		78.4	74.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		1.0	0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.0	(0.2)
Estimated Fair Value		79.4	74.8
Short-term Investments [Member] | Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		6.7	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		$ 6.7	$ 4.6
[1] Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): June 30, 2016 December 31, 2015Short-term investments$372.9 $328.7Other investments717.9 628.9Total$1,090.8 $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
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-URI http://asc.fasb.org/extlink&oid=66010992&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
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+ References

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