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Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Available-for-Sale: |  |
Fair Value, Less than 12 Months | $ 1,728.8 | $ 5,071.9
Gross Unrealized Losses, Less than 12 Months | (74.9) | (346.6)
Fair Value, 12 Months or Longer | 4,306.5 | 1,545.6
Gross Unrealized Losses, 12 Months or Longer | (458.2) | (283.1)
Fair Value, Total | 6,035.3 | 6,617.5
Gross Unrealized Losses, Total | (533.1) | (629.7)
Allowance for Credit Losses | (2.6) | 0.0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 6,582.2 | 7,573.5
Gross Unrealized Gains | 0.2 | 2.3
Gross Unrealized Losses | (533.1) | (629.7)
Estimated Fair Value | 6,049.3 | 6,946.1
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 6,584.8 |
US Treasury Notes Securities |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 48.1 |
Gross Unrealized Losses, Less than 12 Months | (1.3) |
Fair Value, 12 Months or Longer | 175.1 |
Gross Unrealized Losses, 12 Months or Longer | (25.6) |
Fair Value, Total | 223.2 |
Gross Unrealized Losses, Total | (26.9) |
U.S. Treasury notes |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months |  | 168.8
Gross Unrealized Losses, Less than 12 Months |  | (4.7)
Fair Value, 12 Months or Longer |  | 170.4
Gross Unrealized Losses, 12 Months or Longer |  | (29.8)
Fair Value, Total |  | 339.2
Gross Unrealized Losses, Total |  | (34.5)
Allowance for Credit Losses | 0.0 |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 250.1 | 675.1
Gross Unrealized Gains | 0.0 | 2.1
Gross Unrealized Losses | (26.9) | (34.5)
Estimated Fair Value | 223.2 | 642.7
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 250.1 |
State, county, and municipal securities |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 8.0 | 104.9
Gross Unrealized Losses, Less than 12 Months | (0.3) | (9.0)
Fair Value, 12 Months or Longer | 210.0 | 146.1
Gross Unrealized Losses, 12 Months or Longer | (40.6) | (41.6)
Fair Value, Total | 218.0 | 251.0
Gross Unrealized Losses, Total | (40.9) | (50.6)
Allowance for Credit Losses | 0.0 |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 262.0 | 314.3
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (40.9) | (50.6)
Estimated Fair Value | 221.1 | 263.7
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 262.0 |
Obligations of U.S. government agencies |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 86.7 | 152.2
Gross Unrealized Losses, Less than 12 Months | (4.0) | (10.1)
Fair Value, 12 Months or Longer | 86.8 | 46.1
Gross Unrealized Losses, 12 Months or Longer | (8.3) | (7.2)
Fair Value, Total | 173.5 | 198.3
Gross Unrealized Losses, Total | (12.3) | (17.3)
Allowance for Credit Losses | 0.0 |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 186.4 | 216.2
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (12.3) | (17.3)
Estimated Fair Value | 174.1 | 198.9
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 186.4 |
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 1,388.6 | 3,299.7
Gross Unrealized Losses, Less than 12 Months | (63.5) | (262.3)
Fair Value, 12 Months or Longer | 2,459.5 | 948.4
Gross Unrealized Losses, 12 Months or Longer | (299.3) | (163.7)
Fair Value, Total | 3,848.1 | 4,248.1
Gross Unrealized Losses, Total | (362.8) | (426.0)
Allowance for Credit Losses | 0.0 |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 4,221.0 | 4,685.5
Gross Unrealized Gains | 0.2 | 0.2
Gross Unrealized Losses | (362.8) | (426.0)
Estimated Fair Value | 3,858.4 | 4,259.7
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 4,221.0 |
Private mortgage-backed securities |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 0.1 | 133.1
Gross Unrealized Losses, Less than 12 Months | 0.0 | (19.1)
Fair Value, 12 Months or Longer | 225.0 | 94.9
Gross Unrealized Losses, 12 Months or Longer | (35.2) | (17.8)
Fair Value, Total | 225.1 | 228.0
Gross Unrealized Losses, Total | (35.2) | (36.9)
Allowance for Credit Losses | 0.0 |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 260.3 | 264.9
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (35.2) | (36.9)
Estimated Fair Value | 225.1 | 228.0
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 260.3 |
Collateralized Loan Obligations |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 117.3 | 1,082.6
Gross Unrealized Losses, Less than 12 Months | (3.0) | (33.1)
Fair Value, 12 Months or Longer | 996.6 | 28.9
Gross Unrealized Losses, 12 Months or Longer | (26.4) | (0.5)
Fair Value, Total | 1,113.9 | 1,111.5
Gross Unrealized Losses, Total | (29.4) | (33.6)
Allowance for Credit Losses |  |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 1,143.3 | 1,145.2
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (29.4) | (33.6)
Estimated Fair Value | 1,113.9 | 1,111.6
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 1,143.3 |
Corporate Debt Securities |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 80.0 | 130.6
Gross Unrealized Losses, Less than 12 Months | (2.8) | (8.3)
Fair Value, 12 Months or Longer | 153.5 | 110.8
Gross Unrealized Losses, 12 Months or Longer | (22.8) | (22.5)
Fair Value, Total | 233.5 | 241.4
Gross Unrealized Losses, Total | (25.6) | (30.8)
Allowance for Credit Losses | (2.6) |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 259.1 | 272.3
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (25.6) | (30.8)
Estimated Fair Value | 233.5 | $ 241.5
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | $ 261.7 |

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