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Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents $ 486.4 $ 551.3
Total short-term investments 593.8 607.7
Equity Investments 20.6  
Corporate notes and obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 286.9 286.6
U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 175.4 171.3
Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 58.5 53.8
Certificates of deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 30.8 38.2
Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 21.4 24.2
U.S. agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 15.5 27.2
Supranational securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 2.8 4.0
Municipal securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 2.5 2.4
Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 373.0 444.3
Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 1.3 2.0
Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 614.4 607.7
Total cash equivalents and short-term investments 988.7  
Equity Investments   9.8
Total   1,063.8
Fair Value, Measurements, Recurring | Corporate notes and obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 286.9 286.6
Fair Value, Measurements, Recurring | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 175.4 171.3
Fair Value, Measurements, Recurring | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 58.5 53.8
Fair Value, Measurements, Recurring | Certificates of deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 30.8 38.2
Fair Value, Measurements, Recurring | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 21.4 24.2
Fair Value, Measurements, Recurring | Equity securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 20.6  
Fair Value, Measurements, Recurring | U.S. agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 15.5 27.2
Fair Value, Measurements, Recurring | Supranational securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 2.8 4.0
Fair Value, Measurements, Recurring | Municipal securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 2.5 2.4
Fair Value, Measurements, Recurring | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 373.0 444.3
Fair Value, Measurements, Recurring | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 1.3 2.0
Fair Value, Measurements, Recurring | Cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 374.3 446.3
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 20.6 0.0
Total cash equivalents and short-term investments 393.6  
Equity Investments   9.8
Total   454.1
Fair Value, Measurements, Recurring | Level 1 | Corporate notes and obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Certificates of deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Equity securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 20.6  
Fair Value, Measurements, Recurring | Level 1 | U.S. agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Supranational securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Municipal securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 373.0 444.3
Fair Value, Measurements, Recurring | Level 1 | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 373.0 444.3
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 593.8 607.7
Total cash equivalents and short-term investments 595.1  
Equity Investments   0.0
Total   609.7
Fair Value, Measurements, Recurring | Level 2 | Corporate notes and obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 286.9 286.6
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 175.4 171.3
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 58.5 53.8
Fair Value, Measurements, Recurring | Level 2 | Certificates of deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 30.8 38.2
Fair Value, Measurements, Recurring | Level 2 | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 21.4 24.2
Fair Value, Measurements, Recurring | Level 2 | Equity securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0  
Fair Value, Measurements, Recurring | Level 2 | U.S. agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 15.5 27.2
Fair Value, Measurements, Recurring | Level 2 | Supranational securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 2.8 4.0
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 2.5 2.4
Fair Value, Measurements, Recurring | Level 2 | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 0.0 0.0
Fair Value, Measurements, Recurring | Level 2 | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 1.3 2.0
Fair Value, Measurements, Recurring | Level 2 | Cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 1.3 2.0
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Total cash equivalents and short-term investments 0.0  
Equity Investments   0.0
Total   0.0
Fair Value, Measurements, Recurring | Level 3 | Corporate notes and obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Certificates of deposit    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Equity securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0  
Fair Value, Measurements, Recurring | Level 3 | U.S. agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Supranational securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Municipal securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total short-term investments 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Money market funds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Commercial paper    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Cash equivalents    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Total cash equivalents $ 0.0 $ 0.0