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Financial Instruments Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Oct. 31, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jan. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | $ 1,436.5 |  | $ 1,353.0 |  | $ 1,337.5 | $ 1,410.6
Derivative contracts, Amortized Cost | [1] | 3.0 |  | 1.5 |  |  |
Derivative contracts, Gross unrealized gains | [1] | 9.6 |  | 7.8 |  |  |
Derivative contracts, Gross unrealized losses | [1] | (10.3) |  | (7.4) |  |  |
Derivative contracts, Fair Value | [1] | 2.3 |  | 1.9 |  |  |
Amortized Cost |  | 1,928.0 |  | 2,310.6 |  |  |
Gross unrealized gains |  | 15.1 |  | 11.1 |  |  |
Gross unrealized losses |  | (12.2) |  | (11.0) |  |  |
Fair Value |  | 1,930.9 |  | 2,310.7 |  |  |
Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Mutual funds, Amortized Cost |  | 44.2 |  | 38.8 |  |  |
Mutual funds, Gross unrealized gains |  | 1.4 |  | 0.4 |  |  |
Mutual funds, Gross unrealized losses |  | 0.0 |  | (1.2) |  |  |
Mutual funds, Fair Value |  | 45.6 |  | 38.0 |  |  |
Marketable Securities, Current | Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 15.8 |  | 40.0 |  |  |
Marketable securities, Gross unrealized gains |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Gross unrealized losses |  | 0.0 |  | (0.1) |  |  |
Marketable securities, Fair Value |  | 15.8 |  | 39.9 |  |  |
Marketable Securities, Current | Asset backed securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 22.2 |  | 7.3 |  |  |
Marketable securities, Gross unrealized gains |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Gross unrealized losses |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Fair Value |  | 22.2 |  | 7.3 |  |  |
Marketable Securities, Current | Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 140.7 |  | 190.3 |  |  |
Marketable securities, Gross unrealized gains |  | 0.4 |  | 0.0 |  |  |
Marketable securities, Gross unrealized losses |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Fair Value |  | 141.1 |  | 190.3 |  |  |
Marketable Securities, Current | Commercial paper |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 51.5 |  | 141.1 |  |  |
Marketable securities, Gross unrealized gains |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Gross unrealized losses |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Fair Value |  | 51.5 |  | 141.1 |  |  |
Marketable Securities, Current | Corporate bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 225.7 |  |  |  |  |
Marketable securities, Gross unrealized gains |  | 0.1 |  |  |  |  |
Marketable securities, Gross unrealized losses |  | (0.1) |  |  |  |  |
Marketable securities, Fair Value |  | 225.7 |  |  |  |  |
Marketable Securities, Current | Corporate debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  |  |  | 377.1 |  |  |
Marketable securities, Gross unrealized gains |  |  |  | 0.1 |  |  |
Marketable securities, Gross unrealized losses |  |  |  | (0.3) |  |  |
Marketable securities, Fair Value |  |  |  | 376.9 |  |  |
Marketable Securities, Current | Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 7.1 |  | 9.7 |  |  |
Marketable securities, Gross unrealized gains |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Gross unrealized losses |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Fair Value |  | 7.1 |  | 9.7 |  |  |
Marketable Securities, Current | Sovereign debt |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 11.3 |  | 20.1 |  |  |
Marketable securities, Gross unrealized gains |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Gross unrealized losses |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Fair Value |  | 11.3 |  | 20.1 |  |  |
Marketable Securities, Current | U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 12.1 |  | 74.6 |  |  |
Marketable securities, Gross unrealized gains |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Gross unrealized losses |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Fair Value |  | 12.1 |  | 74.6 |  |  |
Marketable Securities, Noncurrent | Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 55.5 |  | 56.8 |  |  |
Marketable securities, Gross unrealized gains |  | 0.1 |  | 0.1 |  |  |
Marketable securities, Gross unrealized losses |  | (0.1) |  | 0.0 |  |  |
Marketable securities, Fair Value |  | 55.5 |  | 56.9 |  |  |
Marketable Securities, Noncurrent | Asset backed securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 58.3 |  | 36.5 |  |  |
Marketable securities, Gross unrealized gains |  | 0.1 |  | 0.1 |  |  |
Marketable securities, Gross unrealized losses |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Fair Value |  | 58.4 |  | 36.6 |  |  |
Marketable Securities, Noncurrent | Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 1.8 |  |  |  |  |
Marketable securities, Gross unrealized gains |  | 0.0 |  |  |  |  |
Marketable securities, Gross unrealized losses |  | 0.0 |  |  |  |  |
Marketable securities, Fair Value |  | 1.8 |  |  |  |  |
Marketable Securities, Noncurrent | Corporate bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 244.1 |  |  |  |  |
Marketable securities, Gross unrealized gains |  | 0.9 |  |  |  |  |
Marketable securities, Gross unrealized losses |  | (0.2) |  |  |  |  |
Marketable securities, Fair Value |  | 244.8 |  |  |  |  |
Marketable Securities, Noncurrent | Corporate debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  |  |  | 320.9 |  |  |
Marketable securities, Gross unrealized gains |  |  |  | 0.3 |  |  |
Marketable securities, Gross unrealized losses |  |  |  | (0.8) |  |  |
Marketable securities, Fair Value |  |  |  | 320.4 |  |  |
Marketable Securities, Noncurrent | Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 8.5 |  | 2.9 |  |  |
Marketable securities, Gross unrealized gains |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Gross unrealized losses |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Fair Value |  | 8.5 |  | 2.9 |  |  |
Marketable Securities, Noncurrent | Sovereign debt |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 12.6 |  | 16.9 |  |  |
Marketable securities, Gross unrealized gains |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Gross unrealized losses |  | 0.0 |  | 0.0 |  |  |
Marketable securities, Fair Value |  | 12.6 |  | 16.9 |  |  |
Marketable Securities, Noncurrent | U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Amortized Cost |  | 73.5 |  | 98.4 |  |  |
Marketable securities, Gross unrealized gains |  | 0.1 |  | 0.3 |  |  |
Marketable securities, Gross unrealized losses |  | (0.2) |  | (0.1) |  |  |
Marketable securities, Fair Value |  | 73.4 |  | 98.6 |  |  |
Convertible debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Convertible debt securities, Amortized Cost | [2] | 6.3 |  | 2.5 |  |  |
Convertible debt securities, Gross unrealized gains | [2] | 2.4 |  | 2.0 |  |  |
Convertible debt securities, Gross unrealized losses | [2] | (1.3) |  | (1.1) |  |  |
Convertible debt securities, Fair Value | [2] | 7.4 |  | 3.4 |  |  |
Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | 7.5 | [3] | 8.5 | [4] |  |
Cash equivalents, Fair Value |  | 7.5 | [3] | 8.5 | [4] |  |
Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | 101.2 | [3] | 267.6 | [4] |  |
Cash equivalents, Fair Value |  | 101.2 | [3] | 267.6 | [4] |  |
Commercial paper |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | 11.8 | [3] | 106.6 | [4] |  |
Cash equivalents, Fair Value |  | 11.8 | [3] | 106.6 | [4] |  |
Custody cash deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | 19.5 | [3] | 2.1 | [4] |  |
Cash equivalents, Fair Value |  | 19.5 | [3] | 2.1 | [4] |  |
Money market funds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | 162.3 | [3] | 382.4 | [4] |  |
Cash equivalents, Fair Value |  | 162.3 | [3] | 382.4 | [4] |  |
Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents | [4] |  |  | 5.0 |  |  |
Cash equivalents, Fair Value | [4] |  |  | 5.0 |  |  |
U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents |  | 631.5 | [3] | 103.0 | [4] |  |
Cash equivalents, Fair Value |  | 631.5 | [3] | 103.0 | [4] |  |
Level 1 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Derivative contracts, Fair Value | [1] | 0.0 |  | 0.0 |  |  |
Fair Value |  | 1,591.1 |  | 1,594.4 |  |  |
Level 1 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Mutual funds, Fair Value |  | 45.6 |  | 38.0 |  |  |
Level 1 | Marketable Securities, Current | Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 15.8 |  | 39.9 |  |  |
Level 1 | Marketable Securities, Current | Asset backed securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 1 | Marketable Securities, Current | Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 141.1 |  | 190.3 |  |  |
Level 1 | Marketable Securities, Current | Commercial paper |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 1 | Marketable Securities, Current | Corporate bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 225.7 |  |  |  |  |
Level 1 | Marketable Securities, Current | Corporate debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  |  |  | 376.9 |  |  |
Level 1 | Marketable Securities, Current | Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 7.1 |  | 9.7 |  |  |
Level 1 | Marketable Securities, Current | Sovereign debt |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 1 | Marketable Securities, Current | U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 12.1 |  | 74.6 |  |  |
Level 1 | Marketable Securities, Noncurrent | Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 55.5 |  | 56.9 |  |  |
Level 1 | Marketable Securities, Noncurrent | Asset backed securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 1 | Marketable Securities, Noncurrent | Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 1.8 |  |  |  |  |
Level 1 | Marketable Securities, Noncurrent | Corporate bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 244.8 |  |  |  |  |
Level 1 | Marketable Securities, Noncurrent | Corporate debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  |  |  | 320.4 |  |  |
Level 1 | Marketable Securities, Noncurrent | Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 8.5 |  | 2.9 |  |  |
Level 1 | Marketable Securities, Noncurrent | Sovereign debt |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 1 | Marketable Securities, Noncurrent | U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 73.4 |  | 98.6 |  |  |
Level 1 | Convertible debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Convertible debt securities, Fair Value | [2] | 0.0 |  | 0.0 |  |  |
Level 1 | Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 7.5 | [3] | 8.5 | [4] |  |
Level 1 | Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 101.2 | [3] | 267.6 | [4] |  |
Level 1 | Commercial paper |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 1 | Custody cash deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 19.5 | [3] | 2.1 | [4] |  |
Level 1 | Money market funds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 1 | Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value | [4] |  |  | 5.0 |  |  |
Level 1 | U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 631.5 | [3] | 103.0 | [4] |  |
Level 2 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Derivative contracts, Fair Value | [1] | 0.7 |  | 1.6 |  |  |
Fair Value |  | 330.8 |  | 712.6 |  |  |
Level 2 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Mutual funds, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 2 | Marketable Securities, Current | Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 2 | Marketable Securities, Current | Asset backed securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 22.2 |  | 7.3 |  |  |
Level 2 | Marketable Securities, Current | Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 2 | Marketable Securities, Current | Commercial paper |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 51.5 |  | 141.1 |  |  |
Level 2 | Marketable Securities, Current | Corporate bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  |  |  |  |
Level 2 | Marketable Securities, Current | Corporate debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  |  |  | 0.0 |  |  |
Level 2 | Marketable Securities, Current | Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 2 | Marketable Securities, Current | Sovereign debt |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 11.3 |  | 20.1 |  |  |
Level 2 | Marketable Securities, Current | U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 2 | Marketable Securities, Noncurrent | Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 2 | Marketable Securities, Noncurrent | Asset backed securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 58.4 |  | 36.6 |  |  |
Level 2 | Marketable Securities, Noncurrent | Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  |  |  |  |
Level 2 | Marketable Securities, Noncurrent | Corporate bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  |  |  |  |
Level 2 | Marketable Securities, Noncurrent | Corporate debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  |  |  | 0.0 |  |  |
Level 2 | Marketable Securities, Noncurrent | Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 2 | Marketable Securities, Noncurrent | Sovereign debt |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 12.6 |  | 16.9 |  |  |
Level 2 | Marketable Securities, Noncurrent | U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 2 | Convertible debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Convertible debt securities, Fair Value | [2] | 0.0 |  | 0.0 |  |  |
Level 2 | Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 2 | Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 2 | Commercial paper |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 11.8 | [3] | 106.6 | [4] |  |
Level 2 | Custody cash deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 2 | Money market funds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 162.3 | [3] | 382.4 | [4] |  |
Level 2 | Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value | [4] |  |  | 0.0 |  |  |
Level 2 | U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 3 |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Derivative contracts, Fair Value | [1] | 1.6 |  | 0.3 |  |  |
Fair Value |  | 9.0 |  | 3.7 |  |  |
Level 3 | Marketable Securities, Current |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Mutual funds, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Marketable Securities, Current | Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Marketable Securities, Current | Asset backed securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Marketable Securities, Current | Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Marketable Securities, Current | Commercial paper |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Marketable Securities, Current | Corporate bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  |  |  |  |
Level 3 | Marketable Securities, Current | Corporate debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  |  |  | 0.0 |  |  |
Level 3 | Marketable Securities, Current | Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Marketable Securities, Current | Sovereign debt |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  |  |  |  |
Level 3 | Marketable Securities, Current | U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Marketable Securities, Noncurrent | Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Marketable Securities, Noncurrent | Asset backed securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Marketable Securities, Noncurrent | Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  |  |  |  |
Level 3 | Marketable Securities, Noncurrent | Corporate bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  |  |  |  |
Level 3 | Marketable Securities, Noncurrent | Corporate debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  |  |  | 0.0 |  |  |
Level 3 | Marketable Securities, Noncurrent | Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Marketable Securities, Noncurrent | Sovereign debt |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Marketable Securities, Noncurrent | U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Marketable securities, Fair Value |  | 0.0 |  | 0.0 |  |  |
Level 3 | Convertible debt securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Convertible debt securities, Fair Value | [2] | 7.4 |  | 3.4 |  |  |
Level 3 | Agency bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 3 | Certificates of deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 3 | Commercial paper |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 3 | Custody cash deposit |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 3 | Money market funds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | 0.0 | [3] | 0.0 | [4] |  |
Level 3 | Municipal bonds |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value | [4] |  |  | 0.0 |  |  |
Level 3 | U.S. government securities |  |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |
Cash equivalents, Fair Value |  | $ 0.0 | [3] | $ 0.0 | [4] |  |
[1] | Included in “Prepaid expenses and other current assets,” “Other assets,” or “Other accrued liabilities” in the accompanying Condensed Consolidated Balance Sheets.
[2] | Considered “available-for-sale” and included in “Other assets” in the accompanying Condensed Consolidated Balance Sheets.
[3] | Included in “Cash and cash equivalents” in the accompanying Condensed Consolidated Balance Sheets.
[4] | Included in “Cash and cash equivalents” in the accompanying Condensed Consolidated Balance Sheets.

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