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Schedule I - Condensed Financial Information of the Registrant - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 01, 2023 | [1] | Oct. 01, 2023 | [1] | Sep. 01, 2023 | [1] | Jun. 29, 2023 | [2] | Sep. 01, 2022 | [1] | Jul. 01, 2022 | [1] | Aug. 04, 2021
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Net assets subject to limitations |  | $ 440.0 |  |  |  |  |  |  |  |  |
Other liabilities |  | 268.1 | $ 384.6 |  |  |  |  |  |  |  |
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 |  | 150.0 |  |  |  |  |  |  |  |  |
ROU asset |  | $ 126.6 | $ 122.4 |  |  |  |  |  |  |  |
Balance sheet location of ROU asset |  | Other assets | Other assets |  |  |  |  |  |  |  |
Lease liability |  | $ 162.3 | $ 161.3 |  |  |  |  |  |  |  |
Balance sheet location of lease liability |  | Other liabilities | Other liabilities |  |  |  |  |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] |  | true |  |  |  |  |  |  |  |  |
Liability |  |  | $ 182.5 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Lease terms |  | 1 year |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Lease terms |  | 9 years |  |  |  |  |  |  |  |  |
Lease extension terms |  | 10 years |  |  |  |  |  |  |  |  |
Reportable Legal Entities | Parent Company |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Net assets subject to limitations |  | $ 440.0 |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 5.30% | 5.12% | 5.07% | 5.00% | 2.88% | 2.21% |
Other liabilities |  | 88.4 | 187.2 |  |  |  |  |  |  |  |
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 |  | 140.0 |  |  |  |  |  |  |  |  |
Loss contingency guarantee to an underwriter of a surety bond, payable |  |  | 200.0 |  |  |  |  |  |  |  |
Loss contingency guarantee to an underwriter of a surety bond, payable increase |  | 209.0 |  |  |  |  |  |  |  |  |
ROU asset |  | $ 54.5 | $ 44.1 |  |  |  |  |  |  |  |
Balance sheet location of ROU asset |  | Other assets | Other assets |  |  |  |  |  |  |  |
Lease liability |  | $ 86.1 | $ 80.4 |  |  |  |  |  |  |  |
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 | 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 | Divestitures | Business Solutions |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Consideration from sale of business |  |  |  |  |  |  |  |  |  |  | $ 910.0
Reportable Legal Entities | Parent Company | Divestitures | Business Solutions | European Union [Member] | Other liabilities |  |  |  |  |  |  |  |  |  |  |
NOTES TO CONDENSED FINANCIAL STATEMENTS |  |  |  |  |  |  |  |  |  |  |
Liability |  |  | $ 104.0 |  |  |  |  |  |  |  |
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 |  | 8 years |  |  |  |  |  |  |  |  |
Lease extension terms |  | 10 years |  |  |  |  |  |  |  |  |
[1] | This note refinanced a note originally issued on a prior date.
[2] | Note is payable to the Parent’s 100% owned indirect subsidiary, Western Union International Bank.

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