3. Fair Value Measurements Short-term Investments (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 327.2		$ 510.4
Unrealized Gains	244.6		165.9
Unrealized Losses	(0.9)		(0.6)
Estimated Fair Value	570.9		675.7
Short-term Investments [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	132.6		239.3
Unrealized Gains	0.3		1.4
Unrealized Losses	(0.4)		(0.1)
Estimated Fair Value	132.5		240.6
Short-term Investments [Member] | Foreign Brokered Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8.9		0.4
Unrealized Gains	0		0
Unrealized Losses	0		0
Estimated Fair Value	8.9		0.4
Short-term Investments [Member] | Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11.1		12.0
Unrealized Gains	0		0.1
Unrealized Losses	(0.1)		0
Estimated Fair Value	11.0		12.1
Short-term Investments [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	48.4		81.6
Unrealized Gains	0.1		0.4
Unrealized Losses	(0.2)		(0.1)
Estimated Fair Value	48.3		81.9
Short-term Investments [Member] | Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	26.6		24.1
Unrealized Gains	5.4		0.7
Unrealized Losses	0		(0.2)
Estimated Fair Value	32.0		24.6
Short-term Investments [Member] | Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	272.3		455.3
Unrealized Gains	5.9		2.9
Unrealized Losses	(0.8)		(0.5)
Estimated Fair Value	277.4		457.7
Short-term Investments [Member] | US Government Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	39.1		92.5
Unrealized Gains	0.1		0.3
Unrealized Losses	(0.1)		(0.1)
Estimated Fair Value	39.1		92.7
Short-term Investments [Member] | Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5.6		5.4
Unrealized Gains	0		0
Unrealized Losses	0		0
Estimated Fair Value	5.6		5.4
Other Long-term Investments [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0.4		0.4
Unrealized Gains	0		0
Unrealized Losses	(0.1)		(0.1)
Estimated Fair Value	0.3		0.3
Other Long-term Investments [Member] | Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54.5		54.5
Unrealized Gains	238.7		163.0
Unrealized Losses	0		0
Estimated Fair Value	293.2		217.5
Other Long-term Investments [Member] | Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54.9		55.1
Unrealized Gains	238.7		163.0
Unrealized Losses	(0.1)		(0.1)
Estimated Fair Value	293.5		218.0
Other Long-term Investments [Member] | Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost			0.2
Unrealized Gains			0
Unrealized Losses			0
Estimated Fair Value			0.2
Fair Value, Inputs, Level 1 [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	325.2	[1]	242.1	[1]
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	0	[1]	0	[1]
Fair Value, Inputs, Level 1 [Member] | Foreign Brokered Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	0	[1]	0	[1]
Fair Value, Inputs, Level 1 [Member] | Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	0	[1]	0	[1]
Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	0	[1]	0	[1]
Fair Value, Inputs, Level 1 [Member] | Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	325.2	[1]	242.1	[1]
Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	0	[1]	0	[1]
Fair Value, Inputs, Level 1 [Member] | Foreign Government Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 0	[1]	$ 0	[1]

[1] Available-for-sale investments are included in the following accounts in the Consolidated Balance Sheets (in millions): December 31, 2013 December 31, 2012 Short-term investments$277.4 $457.7Other investments293.5 218.0Total$570.9 $675.7