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3. Fair Value Measurements Short-term Investments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		$ 382.1	$ 334.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		577.1	251.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		1.6	0.6
Estimated Fair Value	[1]	957.6	585.9
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	156.9	139.9
Foreign Brokered Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]		5.2
Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	6.4	6.5
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	54.8	48.4
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	660.1	334.4
US Government Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	74.8	47.5
Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	[1]	4.6	4.0
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value		328.7	284.4
Short-term Investments [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		157.2	139.7
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		0.1	0.4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.4	0.2
Estimated Fair Value		156.9	139.9
Short-term Investments [Member] | Foreign Brokered Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost			5.2
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			5.2
Short-term Investments [Member] | Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		6.4	6.5
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		6.4	6.5
Short-term Investments [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		54.8	48.2
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		0.0	0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.2	0.2
Estimated Fair Value		54.6	48.0
Short-term Investments [Member] | Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		29.4	29.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		2.7	4.5
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.7	0.2
Estimated Fair Value		31.4	33.3
Short-term Investments [Member] | Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		327.3	280.0
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		2.9	5.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		1.5	0.6
Estimated Fair Value		328.7	284.4
Short-term Investments [Member] | US Government Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		74.9	47.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		0.1	0.1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.2	0.0
Estimated Fair Value		74.8	47.5
Short-term Investments [Member] | Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		4.6	4.0
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		4.6	4.0
Other Long-term Investments [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		0.3	0.4
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		0.0	0.0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.1	0.0
Estimated Fair Value		0.2	0.4
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		574.2	246.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.0	0.0
Estimated Fair Value		628.7	301.1
Other Long-term Investments [Member] | Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		54.8	54.9
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax		574.2	246.6
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		0.1	0.0
Estimated Fair Value		$ 628.9	$ 301.5
[1] Available-for-sale investments are included in the following accounts in the Consolidated Balance Sheets (in millions): December 31, 2015 December 31, 2014 Short-term investments$328.7 $284.4Other investments628.9 301.5Total$957.6 $585.9

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