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Schedule I - Condensed Financial Information of the Registrant - Narrative (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 09, 2019 | Apr. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 01, 2021 | Jan. 01, 2021 | Dec. 01, 2020 | Dec. 01, 2019 | Oct. 01, 2019 | Nov. 08, 2015
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Net assets subject to limitations |  |  | $ 460.0 |  |  |  |  |  |  |  |
Gain on sale |  |  |  |  | $ 524.6 |  |  |  |  |  |
Proceeds from the sale of noncontrolling interest in a private company |  |  | 50.9 |  |  |  |  |  |  |  |
Gain on sale of noncontrolling interest in private company |  |  | 47.9 |  |  |  |  |  |  |  |
Letters of credit outstanding and bank guarantees |  |  | 450.0 |  |  |  |  |  |  |  |
ROU asset |  |  | $ 164.5 | $ 189.1 |  |  |  |  |  |  |
Balance sheet location of ROU asset |  |  | Other assets | Other assets |  |  |  |  |  |  |
Lease liability |  |  | $ 203.0 | $ 234.9 |  |  |  |  |  |  |
Balance sheet location of lease liability |  |  | Other liabilities | Other liabilities |  |  |  |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] |  |  | true |  |  |  |  |  |  |  |
Private Company |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of noncontrolling interest in a private company |  | $ 50.9 |  |  |  |  |  |  |  |  |
Gain on sale of noncontrolling interest in private company |  |  | $ 47.9 |  |  |  |  |  |  |  |
Speedpay | Divestitures |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Consideration from sale of business | $ 750.0 |  |  |  |  |  |  |  |  |  |
Speedpay | Divestitures | Other services |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Gain on sale | 523.0 |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Lease terms |  |  | 1 year |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Lease terms |  |  | 10 years |  |  |  |  |  |  |  |
Lease extension terms |  |  | 10 years |  |  |  |  |  |  |  |
Reportable Legal Entities | Parent Company |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Net assets subject to limitations |  |  | $ 460.0 |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  |  | 0.12% | 0.14% | 0.15% | 1.61% | 1.69% |
Gain on sale |  |  |  |  | $ 524.6 |  |  |  |  |  |
Proceeds from the sale of noncontrolling interest in a private company |  |  | 50.9 |  |  |  |  |  |  |  |
Gain on sale of noncontrolling interest in private company |  |  | 47.9 |  |  |  |  |  |  |  |
Letters of credit outstanding and bank guarantees |  |  | 250.0 |  |  |  |  |  |  |  |
ROU asset |  |  | $ 56.9 | $ 63.1 |  |  |  |  |  |  |
Balance sheet location of ROU asset |  |  | Other assets | Other assets |  |  |  |  |  |  |
Lease liability |  |  | $ 91.3 | $ 100.1 |  |  |  |  |  |  |
Balance sheet location of lease liability |  |  | Other liabilities | Other liabilities |  |  |  |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] |  |  | true | true |  |  |  |  |  |  |
Reportable Legal Entities | Parent Company | Revolver - Parent Company |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  | 0.34% | 0.26% |  |  |  |  |  |  |
Maximum borrowing capacity on unsecured borrowing facilities |  |  |  |  |  |  |  |  |  |  | $ 3,000.0
Outstanding borrowings on unsecured financing facilities |  |  | $ 370.0 | $ 620.3 |  |  |  |  |  |  |
Reportable Legal Entities | Parent Company | Private Company |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Proceeds from the sale of noncontrolling interest in a private company |  | $ 50.9 |  |  |  |  |  |  |  |  |
Gain on sale of noncontrolling interest in private company |  |  | $ 47.9 |  |  |  |  |  |  |  |
Reportable Legal Entities | Parent Company | Speedpay | Divestitures |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Consideration from sale of business | 750.0 |  |  |  |  |  |  |  |  |  |
Reportable Legal Entities | Parent Company | Speedpay | Divestitures | Other services |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Gain on sale | $ 523.0 |  |  |  |  |  |  |  |  |  |
Reportable Legal Entities | Parent Company | Minimum |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Lease terms |  |  | 2 years |  |  |  |  |  |  |  |
Reportable Legal Entities | Parent Company | Maximum |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Lease terms |  |  | 10 years |  |  |  |  |  |  |  |
Lease extension terms |  |  | 10 years |  |  |  |  |  |  |  |

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