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3. Fair Value Measurements Fair Value Level Table (Details) (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Commercial Paper [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Foreign Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Foreign Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Foreign Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Foreign Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Foreign Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Foreign Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Foreign Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Foreign Time Deposits [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Money Market Funds [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Money Market Funds [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Money Market Funds [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Money Market Funds [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Money Market Funds [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Money Market Funds [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Money Market Funds [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Money Market Funds [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Foreign Brokered Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Foreign Brokered Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Foreign Brokered Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Foreign Brokered Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Foreign Brokered Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Foreign Brokered Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Foreign Brokered Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Foreign Brokered Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Foreign Government Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Foreign Government Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Foreign Government Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Foreign Government Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Foreign Government Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Foreign Government Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Foreign Government Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Foreign Government Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Municipal obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Municipal obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Municipal obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Municipal obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Municipal obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Municipal obligations [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Municipal obligations [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Municipal obligations [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Marketable Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Marketable Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Marketable Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Marketable Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Marketable Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Marketable Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Marketable Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Marketable Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 1 [Member]
Sep. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 2 [Member]
Sep. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Fair Value, Inputs, Level 3 [Member]
Sep. 30, 2013
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Other Current Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Other Current Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Other Noncurrent Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Other Noncurrent Liabilities [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Short-term Investments [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Short-term Investments [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Sep. 30, 2013
Short-term Investments [Member]
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Short-term Investments [Member]
Corporate Debt Securities [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Short-term Investments [Member]
Foreign Brokered Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Short-term Investments [Member]
Foreign Brokered Certificates of Deposit [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Short-term Investments [Member]
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Short-term Investments [Member]
US Government Sponsored Agencies [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Short-term Investments [Member]
Foreign Government Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Short-term Investments [Member]
Foreign Government Obligations [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Short-term Investments [Member]
Municipal obligations [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Short-term Investments [Member]
Municipal obligations [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Short-term Investments [Member]
Marketable Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Short-term Investments [Member]
Marketable Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Short-term Investments [Member]
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2012
Short-term Investments [Member]
Asset-backed Securities [Member]
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2013
Other Investments [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Dec. 31, 2012
Other Investments [Member]
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                                                                                                                                                                                                                                          
Cash Equivalents         $ 11,600,000 [1] $ 15,600,000 [1] $ 14,000,000 [1] $ 54,100,000 [1] $ 0 [1] $ 0 [1] $ 25,600,000 [1] $ 69,700,000 [1] $ 1,300,000 [1] $ 0 [1] $ 1,300,000 [1] $ 0 [1] $ 0 [1] $ 14,000,000 [1] $ 52,800,000 [1] $ 0 [1] $ 0 [1] $ 14,000,000 [1] $ 52,800,000 [1] $ 11,400,000 [1] $ 10,100,000 [1] $ 0 [1] $ 0 [1] $ 0 [1] $ 0 [1] $ 11,400,000 [1] $ 10,100,000 [1] $ 200,000 [1] $ 5,500,000 [1] $ 0 [1] $ 0 [1] $ 0 [1] $ 0 [1] $ 200,000 [1] $ 5,500,000 [1]                                   $ 0 [2]                                                                                                                        
Available-for-sale Securities, Fair Value Disclosure     544,100,000 675,700,000 303,500,000 [2] 242,100,000 [2] 240,600,000 [2] 433,600,000 [2] 0 [2] 0 [2] 544,100,000 [2] 675,700,000 [2]                                                       0 [2] 0 [2] 120,300,000 [2] 240,600,000 [2] 0 [2] 0 [2] 120,300,000 [2] 240,600,000 [2] 0 [2] 0 [2] 8,900,000 [2] 400,000 [2] 0 [2] 0 [2] 8,900,000 [2] 400,000 [2] 0 [2] 0 [2] 42,300,000 [2] 92,700,000 [2] 0 [2] 0 [2] 42,300,000 [2] 92,700,000 [2] 0 [2] 0 [2] 6,900,000 [2] 5,600,000 [2] 0 [2] 0 [2] 6,900,000 [2] 5,600,000 [2] 0 [2] 0 [2] 10,600,000 [2] 12,100,000 [2] 0 [2] 0 [2] 10,600,000 [2] 12,100,000 [2] 303,500,000 [2] 242,100,000 [2] 0 [2] 0 [2] 0 [2] 0 [2] 303,500,000 [2] 242,100,000 [2] 0 [2] 0 [2] 51,600,000 [2] 82,200,000 [2] 0 [2] 0 [2] 51,600,000 [2] 82,200,000 [2]         270,000,000 457,700,000 120,300,000 240,600,000 8,900,000 400,000 42,300,000 92,700,000 6,900,000 5,400,000 10,600,000 12,100,000 29,700,000 24,600,000 51,300,000 81,900,000 274,100,000 218,000,000
Forward Foreign Exchange Contracts, Asset, Fair Value Disclosure         0 [3] 0 [3] 900,000 [3] 1,100,000 [3] 0 [3] 0 [3] 900,000 [3] 1,100,000 [3]                                                                                                                                                                                                                  
Assets, Fair Value Disclosure         315,100,000 257,700,000 255,500,000 488,800,000 0 0 570,600,000 746,500,000                                                                                                                                                                                                                  
Forward Foreign Exchange Contracts, Liability, Fair Value Disclosure         0 [4] 0 [4] 1,100,000 [4] 800,000 [4] 0 [4] 0 [4] 1,100,000 [4] 800,000 [4]                                                                                                                                                                                                                  
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability (1,347,000) (15,984,000)                                                                                                                                                                                                                                      
Liabilities, Fair Value Disclosure         0 0 1,100,000 800,000 25,200,000 52,600,000 26,300,000 53,400,000                                                                                                                                                                                                                  
Contingent Consideration at Fair Value         $ 0 [5] $ 0 [5] $ 0 [5] $ 0 [5] $ 25,200,000 [5] $ 52,600,000 [5] $ 25,200,000 [5] $ 52,600,000 [5]                                                                                                                                                                       $ 6,900,000 $ 27,300,000 $ 18,300,000 $ 25,300,000                                    
[1] Cash equivalents are included in Cash and cash equivalents in the Condensed Consolidated Balance Sheets.
[2] Available-for-sale investments are included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): September 30, 2013 December 31, 2012Short-term investments$270.0 $457.7Other investments274.1 218.0Total$544.1 $675.7
[3] Forward foreign exchange contracts in an asset position are included in Prepaid expenses, taxes and other current assets in the Condensed Consolidated Balance Sheets.
[4] Forward foreign exchange contracts in a liability position are included in Other current liabilities in the Condensed Consolidated Balance Sheets.
[5] Contingent consideration liability is included in the following accounts in the Condensed Consolidated Balance Sheets (in millions): September 30, 2013 December 31, 2012Other current liabilities$6.9 $27.3Other long-term liabilities18.3 25.3 Total$25.2 $52.6