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Income Taxes Provision (Tables)
 12 Months Ended
Dec. 31, 2021
Income Tax Expense Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
 Year Ended December 31,
 202120202019
 (in millions)
Current$181.8 $141.0 $110.1 
Deferred42.0 (25.1)(5.1)
Total tax provision$223.8 $115.9 $105.0 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Year Ended December 31,
202120202019
(in millions)
Income tax at statutory rate$235.8 $130.7 $126.9 
Increase (decrease) resulting from:
State income taxes, net of federal benefits35.8 13.9 11.0 
Tax-exempt income(25.6)(21.7)(19.6)
Investment tax credits(15.9)(13.9)(15.0)
Other, net(6.3)6.9 1.7 
Total tax provision$223.8 $115.9 $105.0 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
December 31,
20212020
(in millions)
Deferred tax assets:
Allowance for credit losses$81.0 $84.6 
Lease liability 38.6 21.1 
Premises and equipment10.0 — 
Accrued expenses9.8 3.6 
Passthrough income 9.1 8.4 
Insurance premiums — 18.9 
Other34.9 29.1 
Total gross deferred tax assets183.4 165.7 
Deferred tax asset valuation allowance— — 
Total deferred tax assets183.4 165.7 
Deferred tax liabilities:
Mortgage servicing rights(57.6)— 
Right of use asset(36.0)(19.2)
Deferred loan costs(15.5)(12.8)
Leasing basis differences (12.3)(11.1)
IRC section 50(d) income(7.7)(9.8)
Estimated loss reserve(7.6)(17.5)
Unearned premiums (7.2)(16.8)
Insurance premiums(6.0)— 
Unrealized gain on AFS securities(5.7)(31.2)
Premises and equipment— (7.6)
Other(6.9)(8.4)
Total deferred tax liabilities(162.5)(134.4)
Deferred tax assets, net$20.9 $31.3 
Summary of Income Tax Contingencies [Table Text Block]
December 31,
20212020
(in millions)
Beginning balance$3.4 $1.7 
Gross increases
Tax positions in prior periods0.8 — 
Current period tax positions2.2 2.2 
Gross decreases
Tax positions in prior periods— — 
Settlements— (0.1)
Lapse of statute of limitations— (0.4)
Ending balance$6.4 $3.4