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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit
A summary of the contractual amounts for unfunded commitments and letters of credit are as follows: 
December 31,
 20212020
 (in millions)
Commitments to extend credit, including unsecured loan commitments of $1,199.8 at December 31, 2021 and $1,077.2 at December 31, 2020
$13,396.3 $9,425.2 
Credit card commitments and financial guarantees306.3 291.5 
Letters of credit, including unsecured letters of credit of $12.9 at December 31, 2021 and $9.9 at December 31, 2020
198.1 186.9 
Total$13,900.7 $9,903.6 
Contractual Obligation, Fiscal Year Maturity [Table Text Block]
Amount of Commitment Expiration per Period
Total Amounts CommittedLess Than 1 Year1-3 Years3-5 YearsAfter 5 Years
(in millions)
Commitments to extend credit$13,396.3 $3,652.0 $6,235.1 $2,322.1 $1,187.0 
Credit card commitments and financial guarantees306.3 306.3 — — — 
Letters of credit198.1 190.7 3.0 4.4 — 
Total$13,900.7 $4,149.0 $6,238.1 $2,326.5 $1,187.0