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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets:
Settlement assets	$ 3,095.7	$ 2,843.5
Derivatives	328.2	247.7
Liabilities:
Derivatives	242.3	183.8
Recurring
Assets:
Derivatives	328.2	247.7
Total assets	1,573.7	1,654.5
Liabilities:
Derivatives	242.3	183.8
Total liabilities	242.3	183.8
Recurring | Money market funds
Assets:
Settlement assets	1.8	7.9
Recurring | State and municipal debt securities
Assets:
Settlement assets	1,012.5	1,219.9
Recurring | State and municipal variable rate demand notes
Assets:
Settlement assets	97.5	84.8
Recurring | Corporate debt securities
Assets:
Settlement assets	110.3
Recurring | Corporate and other debt securities
Assets:
Settlement assets		57.8
Recurring | United States government agency mortgage-backed securities
Assets:
Settlement assets	23.4	36.4
Recurring | Level 1
Assets:
Total assets	1.8	7.9
Recurring | Level 1 | Money market funds
Assets:
Settlement assets	1.8	7.9
Recurring | Level 2
Assets:
Derivatives	328.2	247.7
Total assets	1,571.9	1,646.6
Liabilities:
Derivatives	242.3	183.8
Total liabilities	242.3	183.8
Recurring | Level 2 | State and municipal debt securities
Assets:
Settlement assets	1,012.5	1,219.9
Recurring | Level 2 | State and municipal variable rate demand notes
Assets:
Settlement assets	97.5	84.8
Recurring | Level 2 | Corporate debt securities
Assets:
Settlement assets	110.3
Recurring | Level 2 | Corporate and other debt securities
Assets:
Settlement assets		57.8
Recurring | Level 2 | United States government agency mortgage-backed securities
Assets:
Settlement assets	$ 23.4	$ 36.4

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