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Settlement Assets and Obligations - Components of Investment Securities (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Cash and cash equivalents |  |  |
Amortized Cost | $ 1,295.8 | $ 1,208.3 | $ 1,502.6
Available-for-sale securities: |  |  |
Amortized Cost | 1,428.1 | 1,361.1 |
Fair Value | 1,402.3 | 1,398.9 |
Gross Unrealized Gains | 5.5 | 40.8 |
Gross Unrealized Losses | (31.3) | (3.0) |
Net Unrealized Gains/ (Losses) | (25.8) | 37.8 |
Amortized Cost | 1,434.8 | 1,369.0 |
Fair Value | 1,409.0 | 1,406.8 |
Gross Unrealized Gains | 5.5 | 40.8 |
Gross Unrealized Losses | 31.3 | (3.0) |
Net Unrealized Gains/ (Losses) | (25.8) | 37.8 |
Money market funds | Settlement Assets |  |  |
Cash and cash equivalents |  |  |
Amortized Cost | 6.7 | 7.9 |
Fair Value | 6.7 | 7.9 |
State and municipal debt securities |  |  |
Available-for-sale securities: |  |  |
Amortized Cost | 1,254.8 | 1,182.6 |
Fair Value | 1,232.0 | 1,219.9 |
Gross Unrealized Gains | 5.5 | 39.8 |
Gross Unrealized Losses | (28.3) | (2.5) |
Net Unrealized Gains/ (Losses) | (22.8) | 37.3 |
State and municipal variable rate demand notes |  |  |
Available-for-sale securities: |  |  |
Amortized Cost | 79.9 | 84.8 |
Fair Value | 79.9 | 84.8 |
Corporate debt securities |  |  |
Available-for-sale securities: |  |  |
Amortized Cost | 61.9 |  |
Fair Value | 58.9 |  |
Gross Unrealized Losses | (3.0) |  |
Net Unrealized Gains/ (Losses) | (3.0) |  |
Corporate and other debt securities |  |  |
Available-for-sale securities: |  |  |
Amortized Cost |  | 58.1 |
Fair Value |  | 57.8 |
Gross Unrealized Gains |  | 0.2 |
Gross Unrealized Losses |  | (0.5) |
Net Unrealized Gains/ (Losses) |  | (0.3) |
United States government agency mortgage-backed securities |  |  |
Available-for-sale securities: |  |  |
Amortized Cost | 31.5 | 35.6 |
Fair Value | $ 31.5 | 36.4 |
Gross Unrealized Gains |  | 0.8 |
Net Unrealized Gains/ (Losses) |  | $ 0.8 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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