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3. Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments, at Fair Value $ 5.6 $ 4.6
Available-for-sale investments [1] 1,301.4 1,115.6
Forward foreign exchange contracts, Asset [2] 0.5 0.6
Financial Assets Carried at Fair Value 1,411.8 1,173.7
Forward foreign exchange contracts, Liability [3] 1.6 1.3
Business Combination, Contingent Consideration, Liability [4] 16.7 38.5
Liabilities, Fair Value Disclosure 18.3 39.8
Interest-bearing Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0.7 3.6
Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 185.7 179.4
US Government Sponsored Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 67.6 82.5
Foreign Government Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 3.4 4.4
Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 15.0 15.4
Marketable Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 973.4 767.8
Asset-backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments [1] 55.6 62.5
Foreign Time Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 53.7 11.8
US Government Sponsored Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 11.2 [5] 1.1
Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 3.4 5.9
Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 36.0 14.1
Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 104.3 52.9
Domestic Time Deposit [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5]   20.0
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments, at Fair Value 5.6 4.6
Available-for-sale investments [1] 973.4 767.8
Forward foreign exchange contracts, Asset [2] 0.0 0.0
Financial Assets Carried at Fair Value 1,026.1 790.1
Forward foreign exchange contracts, Liability [3] 0.0 0.0
Business Combination, Contingent Consideration, Liability [4] 0.0 0.0
Liabilities, Fair Value Disclosure 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | Interest-bearing Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0.0 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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 973.4 767.8
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 [1] 0.0 0.0
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 [5] 43.7 11.8
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 0.0 [5] 0.0
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 [5] 3.4 5.9
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 47.1 17.7
Fair Value, Inputs, Level 1 [Member] | Domestic Time Deposit [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5]   0.0
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments, at Fair Value 0.0 0.0
Available-for-sale investments [1] 328.0 347.8
Forward foreign exchange contracts, Asset [2] 0.5 0.6
Financial Assets Carried at Fair Value 385.7 383.6
Forward foreign exchange contracts, Liability [3] 1.6 1.3
Business Combination, Contingent Consideration, Liability [4] 0.0 0.0
Liabilities, Fair Value Disclosure 1.6 1.3
Fair Value, Inputs, Level 2 [Member] | Interest-bearing Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0.7 3.6
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 [1] 185.7 179.4
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 [1] 67.6 82.5
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 [1] 3.4 4.4
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 [1] 15.0 15.4
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 [1] 0.0 0.0
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 [1] 55.6 62.5
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 [5] 10.0 0.0
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 11.2 [5] 1.1
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 [5] 0.0 0.0
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 36.0 14.1
Fair Value, Inputs, Level 2 [Member] | Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 57.2 35.2
Fair Value, Inputs, Level 2 [Member] | Domestic Time Deposit [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5]   20.0
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Restricted Investments, at Fair Value 0.0 0.0
Available-for-sale investments [1] 0.0 0.0
Forward foreign exchange contracts, Asset [2] 0.0 0.0
Financial Assets Carried at Fair Value 0.0 0.0
Forward foreign exchange contracts, Liability [3] 0.0 0.0
Business Combination, Contingent Consideration, Liability [4] 16.7 38.5
Liabilities, Fair Value Disclosure 16.7 38.5
Fair Value, Inputs, Level 3 [Member] | Interest-bearing Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0.0 0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [1] 0.0 0.0
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 [5] 0.0 0.0
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 0.0 [5] 0.0
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 [5] 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5] 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Domestic Time Deposit [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents [5]   0.0
Other Current Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Combination, Contingent Consideration, Liability 2.7 14.5
Short-term Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 371.2 383.2
Short-term Investments [Member] | Interest-bearing Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0.7 3.6
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 185.7 179.4
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 67.6 82.5
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 3.4 4.4
Short-term Investments [Member] | Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 15.0 15.4
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 43.4 35.7
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 55.4 62.2
Other Investments [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 930.2 732.4
Other Noncurrent Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Business Combination, Contingent Consideration, Liability $ 14.0 $ 24.0
[1]
Available-for-sale investments are included in the following accounts in the Consolidated Balance Sheets (in millions):
 
December 31,
2017
 
December 31, 2016
 
 
 
 
Short-term investments
$
371.2

 
$
383.2

Other investments
930.2

 
732.4

Total
$
1,301.4

 
$
1,115.6
[2] Forward foreign exchange contracts in an asset position are included in Other current assets in the Consolidated Balance Sheets.
[3] Forward foreign exchange contracts in a liability position are included in Other current liabilities in the Consolidated Balance Sheets.
[4] Contingent consideration liabilities are included in the following accounts in the Consolidated Balance Sheets (in millions):
 
December 31, 2017
 
December 31, 2016
 
 
 
 
Other current liabilities
$
2.7

 
$
14.5

Other long-term liabilities
14.0

 
24.0

   Total
$
16.7

 
$
38.5
[5] Cash equivalents are included in Cash and cash equivalents in the Consolidated Balance Sheets.