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Financial Instruments Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jul. 31, 2017 | Jan. 31, 2017 | Jul. 31, 2016 | Jan. 31, 2016
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | $ 1,174.1 | $ 1,213.1 | $ 1,467.3 | $ 1,353.0
Derivative contract assets, Amortized Cost | 3.0 | 2.2 |  |
Derivative contract assets, Gross unrealized gains | 10.2 | 12.3 |  |
Derivative contract assets, Gross unrealized losses | (2.2) | (1.3) |  |
Derivative contract assets | 11.0 | 13.2 |  |
Derivative contract liabilities, Amortized Cost | 0.0 | 0.0 |  |
Derivative contract liabilities, Gross unrealized gains | 0.0 | 0.0 |  |
Derivative contract liabilities, Gross unrealized losses | (19.3) | (10.4) |  |
Derivative contract liabilities | (19.3) | (10.4) |  |
Amortized Cost | 1,547.4 | 1,903.5 |  |
Gross unrealized gains | 19.8 | 17.4 |  |
Gross unrealized losses | (24.7) | (13.6) |  |
Fair Value | 1,542.5 | 1,907.3 |  |
Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Mutual funds, Amortized Cost | 48.7 | 44.8 |  |
Mutual funds, Gross unrealized gains | 5.7 | 2.5 |  |
Mutual funds, Gross unrealized losses | 0.0 | 0.0 |  |
Mutual funds, Fair Value | 54.4 | 47.3 |  |
Marketable Securities, Current | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 7.5 | 13.2 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 |  |  |
Marketable securities, Fair Value | 7.5 | 13.2 |  |
Marketable Securities, Current | Asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 30.2 | 19.6 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 30.2 | 19.6 |  |
Marketable Securities, Current | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 13.0 | 157.3 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 13.0 | 157.3 |  |
Marketable Securities, Current | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 98.9 | 109.2 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 98.9 | 109.2 |  |
Marketable Securities, Current | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 219.3 | 234.7 |  |
Marketable securities, Gross unrealized gains | 0.1 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | (0.2) |  |
Marketable securities, Fair Value | 219.4 | 234.5 |  |
Marketable Securities, Current | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 36.7 | 43.4 |  |
Marketable securities, Gross unrealized gains | 0.1 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 36.8 | 43.4 |  |
Marketable Securities, Current | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 14.0 | 30.0 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 14.0 | 30.0 |  |
Marketable Securities, Current | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 59.4 | 32.3 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 59.4 | 32.3 |  |
Marketable Securities, Noncurrent | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 7.5 | 7.1 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 7.5 | 7.1 |  |
Marketable Securities, Noncurrent | Asset backed securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 57.6 | 65.8 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.1 |  |
Marketable securities, Gross unrealized losses | (0.1) | 0.0 |  |
Marketable securities, Fair Value | 57.5 | 65.9 |  |
Marketable Securities, Noncurrent | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 126.3 | 172.1 |  |
Marketable securities, Gross unrealized gains | 0.3 | 0.1 |  |
Marketable securities, Gross unrealized losses | 0.0 | (0.1) |  |
Marketable securities, Fair Value | 126.6 | 172.1 |  |
Marketable Securities, Noncurrent | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 5.0 | 10.7 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 5.0 | 10.7 |  |
Marketable Securities, Noncurrent | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 1.6 | 1.5 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.0 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 1.6 | 1.5 |  |
Marketable Securities, Noncurrent | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Amortized Cost | 37.8 | 48.8 |  |
Marketable securities, Gross unrealized gains | 0.0 | 0.1 |  |
Marketable securities, Gross unrealized losses | 0.0 | 0.0 |  |
Marketable securities, Fair Value | 37.8 | 48.9 |  |
Convertible debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible debt securities, Amortized Cost | 10.7 | 4.9 |  |
Convertible debt securities, Gross unrealized gains | 3.4 | 2.3 |  |
Convertible debt securities, Gross unrealized losses | (3.1) | (1.6) |  |
Convertible debt securities, Fair Value | 11.0 | 5.6 |  |
Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 7.0 | 6.0 |  |
Cash equivalents, Fair Value | 7.0 | 6.0 |  |
Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 61.3 | 63.1 |  |
Cash equivalents, Fair Value | 61.3 | 63.1 |  |
Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 23.0 | 40.2 |  |
Cash equivalents, Fair Value | 23.0 | 40.2 |  |
Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 167.6 | 207.4 |  |
Cash equivalents, Fair Value | 167.6 | 207.4 |  |
Custody cash deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 42.8 | 3.2 |  |
Cash equivalents, Fair Value | 42.8 | 3.2 |  |
Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 15.0 | 5.0 |  |
Cash equivalents, Fair Value | 15.0 | 5.0 |  |
Money Market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 348.5 | 256.5 |  |
Cash equivalents, Fair Value | 348.5 | 256.5 |  |
Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 5.0 | 15.0 |  |
Cash equivalents, Fair Value | 5.0 | 15.0 |  |
U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 100.0 | 309.5 |  |
Cash equivalents, Fair Value | 100.0 | 309.5 |  |
Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Derivative contract assets | 0.0 | 0.0 |  |
Derivative contract liabilities | 0.0 | 0.0 |  |
Fair Value | 816.5 | 1,193.8 |  |
Level 1 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Mutual funds, Fair Value | 54.4 | 47.3 |  |
Level 1 | Marketable Securities, Current | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 7.5 | 13.2 |  |
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 | 13.0 | 157.3 |  |
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 debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 219.4 | 234.5 |  |
Level 1 | Marketable Securities, Current | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 36.8 | 43.4 |  |
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 | 59.4 | 32.3 |  |
Level 1 | Marketable Securities, Noncurrent | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 7.5 | 7.1 |  |
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 | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 126.6 | 172.1 |  |
Level 1 | Marketable Securities, Noncurrent | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 5.0 | 10.7 |  |
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 | 37.8 | 48.9 |  |
Level 1 | Convertible debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible debt securities, Fair Value | 0.0 | 0.0 |  |
Level 1 | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 7.0 | 6.0 |  |
Level 1 | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 61.3 | 63.1 |  |
Level 1 | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 23.0 | 40.2 |  |
Level 1 | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 1 | Custody cash deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 42.8 | 3.2 |  |
Level 1 | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 15.0 | 5.0 |  |
Level 1 | Money Market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 1 | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 1 | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 100.0 | 309.5 |  |
Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Derivative contract assets | 9.0 | 11.9 |  |
Derivative contract liabilities | (19.3) | (10.4) |  |
Fair Value | 713.0 | 706.6 |  |
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 | 30.2 | 19.6 |  |
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 | 98.9 | 109.2 |  |
Level 2 | Marketable Securities, Current | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 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 | 14.0 | 30.0 |  |
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 | 57.5 | 65.9 |  |
Level 2 | Marketable Securities, Noncurrent | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 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 | 1.6 | 1.5 |  |
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 | 0.0 | 0.0 |  |
Level 2 | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 2 | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 2 | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 2 | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 167.6 | 207.4 |  |
Level 2 | Custody cash deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 2 | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 2 | Money Market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 348.5 | 256.5 |  |
Level 2 | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 5.0 | 15.0 |  |
Level 2 | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Derivative contract assets | 2.0 | 1.3 |  |
Derivative contract liabilities | 0.0 | 0.0 |  |
Fair Value | 13.0 | 6.9 |  |
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 debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 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 | 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 | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Marketable securities, Fair Value | 0.0 | 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 | 11.0 | 5.6 |  |
Level 3 | Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Custody cash deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Money Market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | 0.0 | 0.0 |  |
Level 3 | U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents, Fair Value | $ 0.0 | $ 0.0 |  |

X
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