3. Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	$ 570.9		$ 675.7
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	12.3	[1]	15.6	[1]
Available-for-sale investments	325.2	[2]	242.1	[2]
Forward foreign exchange contracts, Asset	0	[3]	0	[3]
Financial Assets Carried at Fair Value	337.5		257.7
Forward foreign exchange contracts, Liability	0	[4]	0	[4]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	0	[5]	0	[5]
Liabilities, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 1 [Member] | Foreign Brokered Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 1 [Member] | Foreign Government Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 1 [Member] | Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 1 [Member] | Marketable Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	325.2	[2]	242.1	[2]
Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	[1]	0	[1]
Fair Value, Inputs, Level 1 [Member] | Foreign Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	11.1	[1]	10.1	[1]
Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	[1]	0	[1]
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1.2	[1]	5.5	[1]
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	8.2	[1]	54.1	[1]
Available-for-sale investments	245.7	[2]	433.6	[2]
Forward foreign exchange contracts, Asset	0.6	[3]	1.1	[3]
Financial Assets Carried at Fair Value	254.5		488.8
Forward foreign exchange contracts, Liability	1.1	[4]	0.8	[4]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	0	[5]	0	[5]
Liabilities, Fair Value Disclosure	1.1		0.8
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	132.5	[2]	240.6	[2]
Fair Value, Inputs, Level 2 [Member] | Foreign Brokered Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	8.9	[2]	0.4	[2]
Fair Value, Inputs, Level 2 [Member] | US Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	39.1	[2]	92.7	[2]
Fair Value, Inputs, Level 2 [Member] | Foreign Government Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	5.6	[2]	5.6	[2]
Fair Value, Inputs, Level 2 [Member] | Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	11.0	[2]	12.1	[2]
Fair Value, Inputs, Level 2 [Member] | Marketable Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	48.6	[2]	82.2	[2]
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	7.0	[1]	52.8	[1]
Fair Value, Inputs, Level 2 [Member] | Foreign Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	[1]	0	[1]
Fair Value, Inputs, Level 2 [Member] | US Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1.2	[1]	1.3	[1]
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	[1]	0	[1]
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	[1]	0	[1]
Available-for-sale investments	0	[2]	0	[2]
Forward foreign exchange contracts, Asset	0	[3]	0	[3]
Financial Assets Carried at Fair Value	0		0
Forward foreign exchange contracts, Liability	0	[4]	0	[4]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	20.8	[5]	52.6	[5]
Liabilities, Fair Value Disclosure	20.8		52.6
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 3 [Member] | Foreign Brokered Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 3 [Member] | Foreign Government Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 3 [Member] | Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 3 [Member] | Marketable Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	0	[2]	0	[2]
Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	[1]	0	[1]
Fair Value, Inputs, Level 3 [Member] | Foreign Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	[1]	0	[1]
Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	[1]	0	[1]
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	[1]	0	[1]
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	20.5	[1]	69.7	[1]
Available-for-sale investments	570.9	[2]	675.7	[2]
Forward foreign exchange contracts, Asset	0.6	[3]	1.1	[3]
Financial Assets Carried at Fair Value	592.0		746.5
Forward foreign exchange contracts, Liability	1.1	[4]	0.8	[4]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	20.8	[5]	52.6	[5]
Liabilities, Fair Value Disclosure	21.9		53.4
Estimate of Fair Value Measurement [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	132.5	[2]	240.6	[2]
Estimate of Fair Value Measurement [Member] | Foreign Brokered Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	8.9	[2]	0.4	[2]
Estimate of Fair Value Measurement [Member] | US Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	39.1	[2]	92.7	[2]
Estimate of Fair Value Measurement [Member] | Foreign Government Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	5.6	[2]	5.6	[2]
Estimate of Fair Value Measurement [Member] | Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	11.0	[2]	12.1	[2]
Estimate of Fair Value Measurement [Member] | Marketable Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	325.2	[2]	242.1	[2]
Estimate of Fair Value Measurement [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	48.6	[2]	82.2	[2]
Estimate of Fair Value Measurement [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	7.0	[1]	52.8	[1]
Estimate of Fair Value Measurement [Member] | Foreign Time Deposits [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	11.1	[1]	10.1	[1]
Estimate of Fair Value Measurement [Member] | US Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1.2	[1]	1.3	[1]
Estimate of Fair Value Measurement [Member] | Money Market Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1.2	[1]	5.5	[1]
Other Current Liabilities [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	6.1		27.3
Short-term Investments [Member] | Corporate Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	132.5		240.6
Short-term Investments [Member] | Foreign Brokered Certificates of Deposit [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	8.9		0.4
Short-term Investments [Member] | US Government Sponsored Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	39.1		92.7
Short-term Investments [Member] | Foreign Government Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	5.6		5.4
Short-term Investments [Member] | Municipal Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	11.0		12.1
Short-term Investments [Member] | Marketable Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	32.0		24.6
Short-term Investments [Member] | Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	48.3		81.9
Short-term Investments [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	277.4		457.7
Other Investments [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale investments	293.5		218.0
Other Noncurrent Liabilities [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	$ 14.7		$ 25.3

[1] Cash equivalents are included in Cash and cash equivalents in the Consolidated Balance Sheets.

[2] 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

[3] Forward foreign exchange contracts in an asset position are included in Prepaid expenses, taxes and other current assets in the Consolidated Balance Sheets.

[4] Forward foreign exchange contracts in a liability position are included in Other current liabilities in the Consolidated Balance Sheets.

[5] The contingent consideration liability is included in the following accounts in the Consolidated Balance Sheet (in millions): December 31, 2013 December 31, 2012 Other current liabilities$6.1 $27.3Other long-term liabilities14.7 25.3 Total$20.8 $52.6