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Financial Instruments - Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | $ 1,353.0 |  | $ 1,410.6 |  | $ 1,853.0 | $ 1,612.2
Derivative Instruments And Hedges at Amortized Cost |  | 1.5 | [1] | 3.5 | [2] |  |
Unrealized Gain on Foreign Currency Derivatives |  | 7.8 | [1] | 19.5 | [2] |  |
Unrealized Loss on Foreign Currency Derivatives |  | (7.4) | [1] | (7.0) | [2] |  |
Derivative Contracts, Fair Value |  | 1.9 | [1] | 16.0 | [2] |  |
Amortized Cost Securities |  | 2,310.6 |  | 1,592.6 |  |  |
Unrealized Gain on Securities |  | 11.1 |  | 26.6 |  |  |
Unrealized Loss on Securities |  | (11.0) |  | (9.4) |  |  |
Total |  | 2,310.7 |  | 1,609.8 |  |  |
Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Trading Securities, Cost |  | 38.8 |  | 36.9 |  |  |
Trading Securities, Unrealized Holding Gain |  | 0.4 |  | 3.4 |  |  |
Trading Securities, Unrealized Holding Loss |  | (1.2) |  | 0.0 |  |  |
Trading Securities |  | 38.0 |  | 40.3 |  |  |
Other Assets |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Convertible Debt Securities, Amortized Cost |  | 2.5 | [3] | 4.7 | [4] |  |
Convertible Debt Securities, Unrealized Gains |  | 2.0 | [3] | 2.5 | [4] |  |
Convertible Debt Securities, Unrealized Losses |  | (1.1) | [3] | (2.1) | [4] |  |
Convertible Debt Securities, Fair Value |  | 3.4 | [3] | 5.1 | [4] |  |
Level 1 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Derivative Contracts, Fair Value |  | 0.0 | [1] | 0.0 | [2] |  |
Total |  | 1,594.4 |  | 1,042.0 |  |  |
Level 1 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Trading Securities |  | 38.0 |  | 40.3 |  |  |
Level 1 | Other Assets |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Convertible Debt Securities, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 2 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Derivative Contracts, Fair Value |  | 1.6 | [1] | 15.1 | [2] |  |
Total |  | 712.6 |  | 561.8 |  |  |
Level 2 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Trading Securities |  | 0.0 |  | 0.0 |  |  |
Level 2 | Other Assets |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Convertible Debt Securities, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 3 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Derivative Contracts, Fair Value |  | 0.3 | [1] | 0.9 | [2] |  |
Total |  | 3.7 |  | 6.0 |  |  |
Level 3 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Trading Securities |  | 0.0 |  | 0.0 |  |  |
Level 3 | Other Assets |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Convertible Debt Securities, Fair Value |  | 3.4 | [3] | 5.1 | [4] |  |
Agency bonds | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  |  |  | 37.9 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  |  |  | 0.0 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  |  |  | 0.0 |  |  |
Available-for-sale Securities, Fair Value |  |  |  | 37.9 |  |  |
Agency bonds | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 56.8 |  | 50.6 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.1 |  | 0.2 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | 0.0 |  | 0.0 |  |  |
Available-for-sale Securities, Fair Value |  | 56.9 |  | 50.8 |  |  |
Agency bonds | Level 1 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  |  |  | 37.9 |  |  |
Agency bonds | Level 1 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 56.9 |  | 50.8 |  |  |
Agency bonds | Level 2 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  |  |  | 0.0 |  |  |
Agency bonds | Level 2 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Agency bonds | Level 3 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  |  |  | 0.0 |  |  |
Agency bonds | Level 3 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Asset backed securities | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 7.3 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.0 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | 0.0 |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 7.3 |  |  |  |  |
Asset backed securities | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 36.5 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.1 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | 0.0 |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 36.6 |  |  |  |  |
Asset backed securities | Level 1 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
Asset backed securities | Level 1 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
Asset backed securities | Level 2 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 7.3 |  |  |  |  |
Asset backed securities | Level 2 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 36.6 |  |  |  |  |
Asset backed securities | Level 3 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
Asset backed securities | Level 3 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
Certificates of deposit | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 190.3 |  | 101.9 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.0 |  | 0.0 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | 0.0 |  | 0.0 |  |  |
Available-for-sale Securities, Fair Value |  | 190.3 |  | 101.9 |  |  |
Certificates of deposit | Level 1 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 190.3 |  | 101.9 |  |  |
Certificates of deposit | Level 2 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Certificates of deposit | Level 3 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Commercial paper | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 141.1 |  | 258.4 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.0 |  | 0.0 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | 0.0 |  | 0.0 |  |  |
Available-for-sale Securities, Fair Value |  | 141.1 |  | 258.4 |  |  |
Commercial paper | Level 1 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Commercial paper | Level 2 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 141.1 |  | 258.4 |  |  |
Commercial paper | Level 3 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Corporate debt securities | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 377.1 |  | 148.0 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.1 |  | 0.1 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | (0.3) |  | (0.1) |  |  |
Available-for-sale Securities, Fair Value |  | 376.9 |  | 148.0 |  |  |
Corporate debt securities | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 320.9 |  | 199.4 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.3 |  | 0.6 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | (0.8) |  | (0.2) |  |  |
Available-for-sale Securities, Fair Value |  | 320.4 |  | 199.8 |  |  |
Corporate debt securities | Level 1 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 376.9 |  | 148.0 |  |  |
Corporate debt securities | Level 1 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 320.4 |  | 199.8 |  |  |
Corporate debt securities | Level 2 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Corporate debt securities | Level 2 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Corporate debt securities | Level 3 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Corporate debt securities | Level 3 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Municipal bonds | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 9.7 |  | 29.2 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.0 |  | 0.1 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | 0.0 |  | 0.0 |  |  |
Available-for-sale Securities, Fair Value |  | 9.7 |  | 29.3 |  |  |
Municipal bonds | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 2.9 |  | 13.3 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.0 |  | 0.1 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | 0.0 |  | 0.0 |  |  |
Available-for-sale Securities, Fair Value |  | 2.9 |  | 13.4 |  |  |
Municipal bonds | Level 1 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 9.7 |  | 29.3 |  |  |
Municipal bonds | Level 1 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 2.9 |  | 13.4 |  |  |
Municipal bonds | Level 2 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Municipal bonds | Level 2 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Municipal bonds | Level 3 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Municipal bonds | Level 3 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Sovereign debt | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 20.1 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.0 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | 0.0 |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 20.1 |  |  |  |  |
Sovereign debt | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 16.9 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.0 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | 0.0 |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 16.9 |  |  |  |  |
Sovereign debt | Level 1 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
Sovereign debt | Level 1 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
Sovereign debt | Level 2 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 20.1 |  |  |  |  |
Sovereign debt | Level 2 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 16.9 |  |  |  |  |
Sovereign debt | Level 3 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
Sovereign debt | Level 3 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
U.S. government agency securities | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 40.0 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.0 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | (0.1) |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 39.9 |  |  |  |  |
U.S. government agency securities | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 98.4 |  | 8.9 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.3 |  | 0.1 |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | (0.1) |  | 0.0 |  |  |
Available-for-sale Securities, Fair Value |  | 98.6 |  | 9.0 |  |  |
U.S. government agency securities | Level 1 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 39.9 |  |  |  |  |
U.S. government agency securities | Level 1 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 98.6 |  | 9.0 |  |  |
U.S. government agency securities | Level 2 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
U.S. government agency securities | Level 2 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
U.S. government agency securities | Level 3 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
U.S. government agency securities | Level 3 | Marketable Securities, Noncurrent |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
U.S. treasury bills | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 74.6 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain |  | 0.0 |  |  |  |  |
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss |  | 0.0 |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 74.6 |  |  |  |  |
U.S. treasury bills | Level 1 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 74.6 |  |  |  |  |
U.S. treasury bills | Level 2 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
U.S. treasury bills | Level 3 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Available-for-sale Securities, Fair Value |  | 0.0 |  |  |  |  |
Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents | [5] | 8.5 |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 8.5 |  |  |  |  |
Agency bonds | Level 1 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 8.5 |  |  |  |  |
Agency bonds | Level 2 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  |  |  |  |
Agency bonds | Level 3 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  |  |  |  |
Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | 267.6 | [5] | 258.6 | [6] |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 267.6 | [5] | 258.6 | [6] |  |
Certificates of deposit | Level 1 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 267.6 | [5] | 258.6 | [6] |  |
Certificates of deposit | Level 2 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0.0 | [5] | 0.0 | [6] |  |
Certificates of deposit | Level 3 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0.0 | [5] | 0.0 |  |  |
Commercial paper |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | 106.6 | [5] | 161.0 | [6] |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 106.6 | [5] | 161.0 | [6] |  |
Commercial paper | Level 1 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0.0 | [5] | 0.0 | [6] |  |
Commercial paper | Level 2 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 106.6 | [5] | 161.0 | [6] |  |
Commercial paper | Level 3 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0.0 | [5] | 0.0 |  |  |
Corporate bond |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents | [6] |  |  | 11.5 |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [6] |  |  | 11.5 |  |  |
Corporate bond | Level 1 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [6] |  |  | 11.5 |  |  |
Corporate bond | Level 2 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [6] |  |  | 0.0 |  |  |
Corporate bond | Level 3 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  |  |  | 0.0 |  |  |
Custody cash deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | 2.1 | [5] | 141.5 | [6] |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 2.1 | [5] | 141.5 | [6] |  |
Custody cash deposit | Level 1 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 2.1 | [5] | 141.5 | [6] |  |
Custody cash deposit | Level 2 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0.0 | [5] | 0.0 | [6] |  |
Custody cash deposit | Level 3 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0.0 | [5] | 0.0 |  |  |
Money market funds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | 382.4 | [5] | 127.3 | [6] |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 382.4 | [5] | 127.3 | [6] |  |
Money market funds | Level 1 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0.0 | [5] | 0.0 | [6] |  |
Money market funds | Level 2 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 382.4 | [5] | 127.3 | [6] |  |
Money market funds | Level 3 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0.0 | [5] | $ 0.0 |  |  |
Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents | [5] | 5.0 |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 5.0 |  |  |  |  |
Municipal bonds | Level 1 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 5.0 |  |  |  |  |
Municipal bonds | Level 2 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  |  |  |  |
Municipal bonds | Level 3 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  |  |  |  |
U.S. treasury bills |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents | [5] | 103.0 |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 103.0 |  |  |  |  |
U.S. treasury bills | Level 1 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 103.0 |  |  |  |  |
U.S. treasury bills | Level 2 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | 0.0 |  |  |  |  |
U.S. treasury bills | Level 3 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | [5] | $ 0.0 |  |  |  |  |
[1] | Included in “Prepaid expenses and other current assets,” "Other assets," or “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.
[2] | Included in “Prepaid expenses and other current assets,” "Other assets," or “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.
[3] | Considered "available for sale" and included in "Other assets" in the accompanying Consolidated Balance Sheets.
[4] | Considered "available for sale" securities and included in "Other assets" in the accompanying Consolidated Balance Sheets.
[5] | Included in “Cash and cash equivalents” in the accompanying Consolidated Balance Sheets.
[6] | Included in “Cash and cash equivalents” in the accompanying Consolidated Balance Sheets.

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