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Financial Instruments - Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions | Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | $ 1,078.0 | $ 1,213.1 | $ 1,353.0 | $ 1,410.6
Derivative contract assets, Amortized Cost | 2.0 | 2.2 |  |
Derivative contract assets, Gross Unrealized Gains | 7.5 | 12.3 |  |
Derivative contract assets, Gross Unrealized Losses | (1.3) | (1.3) |  |
Derivative contract assets, fair value | 8.2 | 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 | (26.6) | (10.4) |  |
Derivative contract liabilities, fair value | (26.6) | (10.4) |  |
Amortized Cost Securities | 1,080.2 | 1,903.5 |  |
Unrealized Gain on Securities | 17.0 | 17.4 |  |
Unrealized Loss on Securities | (29.2) | (13.6) |  |
Total | 1,068.0 | 1,907.3 |  |
Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Trading Securities, Cost | 50.1 | 44.8 |  |
Trading Securities, Unrealized Holding Gain | 8.9 | 2.5 |  |
Trading Securities, Unrealized Holding Loss | 0.0 | 0.0 |  |
Trading Securities | 59.0 | 47.3 |  |
Convertible Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible Debt Securities, Amortized Cost | 7.5 | 4.9 |  |
Convertible Debt Securities, Unrealized Gains | 0.5 | 2.3 |  |
Convertible Debt Securities, Unrealized Losses | (0.2) | (1.6) |  |
Convertible Debt Securities, Fair Value | 7.8 | 5.6 |  |
Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Derivative contract assets, fair value | 0.0 | 0.0 |  |
Derivative contract liabilities, fair value | 0.0 | 0.0 |  |
Total | 392.1 | 1,193.8 |  |
Level 1 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Trading Securities | 59.0 | 47.3 |  |
Level 1 | Convertible Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible Debt Securities, Fair Value | 0.0 | 0.0 |  |
Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Derivative contract assets, fair value | 7.2 | 11.9 |  |
Derivative contract liabilities, fair value | (26.6) | (10.4) |  |
Total | 667.1 | 706.6 |  |
Level 2 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Trading Securities | 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 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Derivative contract assets, fair value | 1.0 | 1.3 |  |
Derivative contract liabilities, fair value | 0.0 | 0.0 |  |
Total | 8.8 | 6.9 |  |
Level 3 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Trading Securities | 0.0 | 0.0 |  |
Level 3 | Convertible Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Convertible Debt Securities, Fair Value | 7.8 | 5.6 |  |
Asset backed securities | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 13.1 | 19.6 |  |
Available-for-sale, Gross unrealized gains | 0.0 | 0.0 |  |
Available-for-sale, Gross unrealized losses | 0.0 | 0.0 |  |
Available-for-sale Securities, Fair Value | 13.1 | 19.6 |  |
Asset backed securities | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 36.8 | 65.8 |  |
Available-for-sale, Gross unrealized gains | 0.0 | 0.1 |  |
Available-for-sale, Gross unrealized losses | (0.2) | 0.0 |  |
Available-for-sale Securities, Fair Value | 36.6 | 65.9 |  |
Asset backed securities | Level 1 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 0.0 | 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 | 0.0 |  |
Asset backed securities | Level 2 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 13.1 | 19.6 |  |
Asset backed securities | Level 2 | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 36.6 | 65.9 |  |
Asset backed securities | Level 3 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 0.0 | 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 | 0.0 |  |
Commercial paper | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 27.5 | 109.2 |  |
Available-for-sale, Gross unrealized gains | 0.0 | 0.0 |  |
Available-for-sale, Gross unrealized losses | 0.0 | 0.0 |  |
Available-for-sale Securities, Fair Value | 27.5 | 109.2 |  |
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 | 27.5 | 109.2 |  |
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 | 99.4 | 234.7 |  |
Available-for-sale, Gross unrealized gains | 0.0 | 0.0 |  |
Available-for-sale, Gross unrealized losses | (0.1) | (0.2) |  |
Available-for-sale Securities, Fair Value | 99.3 | 234.5 |  |
Corporate debt securities | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 100.2 | 172.1 |  |
Available-for-sale, Gross unrealized gains | 0.1 | 0.1 |  |
Available-for-sale, Gross unrealized losses | (0.4) | (0.1) |  |
Available-for-sale Securities, Fair Value | 99.9 | 172.1 |  |
Corporate debt securities | Level 1 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 99.3 | 234.5 |  |
Corporate debt securities | Level 1 | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 99.9 | 172.1 |  |
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 |  |
Other | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 9.2 |  |  |
Available-for-sale, Gross unrealized gains | 0.0 |  |  |
Available-for-sale, Gross unrealized losses | 0.0 |  |  |
Available-for-sale Securities, Fair Value | 9.2 |  |  |
Other | Level 1 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 7.7 |  |  |
Other | Level 2 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 1.5 |  |  |
Other | Level 3 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 0.0 |  |  |
U.S. government securities | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 37.1 | 32.3 |  |
Available-for-sale, Gross unrealized gains | 0.0 | 0.0 |  |
Available-for-sale, Gross unrealized losses | 0.0 | 0.0 |  |
Available-for-sale Securities, Fair Value | 37.1 | 32.3 |  |
U.S. government securities | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 25.5 | 48.8 |  |
Available-for-sale, Gross unrealized gains | 0.0 | 0.1 |  |
Available-for-sale, Gross unrealized losses | (0.2) | 0.0 |  |
Available-for-sale Securities, Fair Value | 25.3 | 48.9 |  |
U.S. government securities | Level 1 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 37.1 | 32.3 |  |
U.S. government securities | Level 1 | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 25.3 | 48.9 |  |
U.S. government securities | Level 2 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 0.0 | 0.0 |  |
U.S. government 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 securities | Level 3 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 0.0 | 0.0 |  |
U.S. government securities | Level 3 | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 0.0 | 0.0 |  |
Agency bonds | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 13.2 |  |
Available-for-sale, Gross unrealized gains |  | 0.0 |  |
Available-for-sale, Gross unrealized losses |  |  |  |
Available-for-sale Securities, Fair Value |  | 13.2 |  |
Agency bonds | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 13.7 | 7.1 |  |
Available-for-sale, Gross unrealized gains | 0.0 | 0.0 |  |
Available-for-sale, Gross unrealized losses | (0.1) | 0.0 |  |
Available-for-sale Securities, Fair Value | 13.6 | 7.1 |  |
Agency bonds | Level 1 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value |  | 13.2 |  |
Agency bonds | Level 1 | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 13.6 | 7.1 |  |
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 |  |
Certificates of deposit | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 157.3 |  |
Available-for-sale, Gross unrealized gains |  | 0.0 |  |
Available-for-sale, Gross unrealized losses |  | 0.0 |  |
Available-for-sale Securities, Fair Value |  | 157.3 |  |
Certificates of deposit | Level 1 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value |  | 157.3 |  |
Certificates of deposit | Level 2 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value |  | 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 |  |
Municipal bonds | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 43.4 |  |
Available-for-sale, Gross unrealized gains |  | 0.0 |  |
Available-for-sale, Gross unrealized losses |  | 0.0 |  |
Available-for-sale Securities, Fair Value |  | 43.4 |  |
Municipal bonds | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 12.7 | 10.7 |  |
Available-for-sale, Gross unrealized gains | 0.0 | 0.0 |  |
Available-for-sale, Gross unrealized losses | (0.1) | 0.0 |  |
Available-for-sale Securities, Fair Value | 12.6 | 10.7 |  |
Municipal bonds | Level 1 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value |  | 43.4 |  |
Municipal bonds | Level 1 | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 12.6 | 10.7 |  |
Municipal bonds | Level 2 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value |  | 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 |  |
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 |  | 30.0 |  |
Available-for-sale, Gross unrealized gains |  | 0.0 |  |
Available-for-sale, Gross unrealized losses |  | 0.0 |  |
Available-for-sale Securities, Fair Value |  | 30.0 |  |
Sovereign debt | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 2.8 | 1.5 |  |
Available-for-sale, Gross unrealized gains | 0.0 | 0.0 |  |
Available-for-sale, Gross unrealized losses | 0.0 | 0.0 |  |
Available-for-sale Securities, Fair Value | 2.8 | 1.5 |  |
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 | 0.0 |  |
Sovereign debt | Level 2 | Marketable Securities, Current |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value |  | 30.0 |  |
Sovereign debt | Level 2 | Marketable Securities, Noncurrent |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Fair Value | 2.8 | 1.5 |  |
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 | 0.0 |  |
Agency bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 5.0 | 6.0 |  |
Cash and Cash Equivalents, Fair Value Disclosure | 5.0 | 6.0 |  |
Agency bonds | Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 5.0 | 6.0 |  |
Agency bonds | Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Agency bonds | Level 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Certificates of deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 17.4 | 63.1 |  |
Cash and Cash Equivalents, Fair Value Disclosure | 17.4 | 63.1 |  |
Certificates of deposit | Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 17.4 | 63.1 |  |
Certificates of deposit | Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Certificates of deposit | Level 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Commercial paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 324.2 | 207.4 |  |
Cash and Cash Equivalents, Fair Value Disclosure | 324.2 | 207.4 |  |
Commercial paper | Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Commercial paper | Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 324.2 | 207.4 |  |
Commercial paper | Level 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Corporate debt securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 5.0 | 40.2 |  |
Cash and Cash Equivalents, Fair Value Disclosure | 5.0 | 40.2 |  |
Corporate debt securities | Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 5.0 | 40.2 |  |
Corporate debt securities | Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Corporate debt securities | Level 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Custody cash deposit |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 5.2 | 3.2 |  |
Cash and Cash Equivalents, Fair Value Disclosure | 5.2 | 3.2 |  |
Custody cash deposit | Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 5.2 | 3.2 |  |
Custody cash deposit | Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Custody cash deposit | Level 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Money market funds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 278.8 | 256.5 |  |
Cash and Cash Equivalents, Fair Value Disclosure | 278.8 | 256.5 |  |
Money market funds | Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Money market funds | Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 278.8 | 256.5 |  |
Money market funds | Level 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Municipal bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 5.0 | 5.0 |  |
Cash and Cash Equivalents, Fair Value Disclosure | 5.0 | 5.0 |  |
Municipal bonds | Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 5.0 | 5.0 |  |
Municipal bonds | Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Municipal bonds | Level 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Sovereign debt |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents | 2.0 | 15.0 |  |
Cash and Cash Equivalents, Fair Value Disclosure | 2.0 | 15.0 |  |
Sovereign debt | Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Sovereign debt | Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 2.0 | 15.0 |  |
Sovereign debt | Level 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
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U.S. government securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash equivalents |  | 309.5 |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 309.5 |  |
U.S. government securities | Level 1 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 309.5 |  |
U.S. government securities | Level 2 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 0.0 |  |
U.S. government securities | Level 3 |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | $ 0.0 |  |

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