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Settlement Assets and Obligations - Summary of Activity in the Allowance for Credit Losses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Summary of activity in allowance for credit losses |  |
Allowance for credit losses, Beginning Balance | $ 53.2 |
Allowance for credit losses, Ending Balance | 23.7 | $ 53.2
Receivables from agents and others |  |
Summary of activity in allowance for credit losses |  |
Allowance for credit losses, Beginning Balance | 49.3 | 20.4
Current period provision for expected credit losses | 8.9 | 39.9
Write-offs charged against the allowance | (44.8) | (11.9)
Recoveries of amounts previously written off | 6.8 | 2.3
Impacts of foreign currency exchange rates and other | (2.2) | (1.4)
Allowance for credit losses, Ending Balance | 18.0 | 49.3
Receivables from Business Solutions customers |  |
Summary of activity in allowance for credit losses |  |
Allowance for credit losses, Beginning Balance | 3.9 | 4.5
Current period provision for expected credit losses | 4.2 | 2.0
Write-offs charged against the allowance | (2.1) | (3.1)
Impacts of foreign currency exchange rates and other | (0.3) | 0.5
Allowance for credit losses, Ending Balance | $ 5.7 | $ 3.9

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