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Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-Sale: |  |
Fair Value, Less than 12 Months | $ 5,554.5 | $ 2,760.3
Gross Unrealized Losses, Less than 12 Months | (421.7) | (58.3)
Fair Value, 12 Months or Longer | 1,201.7 | 68.7
Gross Unrealized Losses, 12 Months or Longer | (243.3) | (1.1)
Fair Value, Total | 6,756.2 | 2,829.0
Gross Unrealized Losses, Total | (665.0) | (59.4)
US Treasury Notes Securities |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 168.2 |
Gross Unrealized Losses, Less than 12 Months | (5.1) |
Fair Value, 12 Months or Longer | 168.6 |
Gross Unrealized Losses, 12 Months or Longer | (31.6) |
Fair Value, Total | 336.8 |
Gross Unrealized Losses, Total | (36.7) |
U.S. Treasury notes |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months |  | 684.7
Gross Unrealized Losses, Less than 12 Months |  | (12.9)
Fair Value, 12 Months or Longer |  | 0.0
Gross Unrealized Losses, 12 Months or Longer |  | 0.0
Fair Value, Total |  | 684.7
Gross Unrealized Losses, Total |  | (12.9)
State, county, and municipal securities |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 110.6 | 278.7
Gross Unrealized Losses, Less than 12 Months | (14.4) | (9.1)
Fair Value, 12 Months or Longer | 136.4 | 5.0
Gross Unrealized Losses, 12 Months or Longer | (42.9) | (0.2)
Fair Value, Total | 247.0 | 283.7
Gross Unrealized Losses, Total | (57.3) | (9.3)
Obligations of U.S. government agencies |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 152.4 | 297.0
Gross Unrealized Losses, Less than 12 Months | (10.9) | (8.9)
Fair Value, 12 Months or Longer | 45.9 | 16.4
Gross Unrealized Losses, 12 Months or Longer | (6.4) | (0.3)
Fair Value, Total | 198.3 | 313.4
Gross Unrealized Losses, Total | (17.3) | (9.2)
U.S. agency residential & commercial mortgage-backed securities & collateralized mortgage obligations |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 3,697.1 | 1,262.8
Gross Unrealized Losses, Less than 12 Months | (308.8) | (23.0)
Fair Value, 12 Months or Longer | 699.8 | 26.4
Gross Unrealized Losses, 12 Months or Longer | (133.9) | (0.3)
Fair Value, Total | 4,396.9 | 1,289.2
Gross Unrealized Losses, Total | (442.7) | (23.3)
Private mortgage-backed securities |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 206.1 | 127.2
Gross Unrealized Losses, Less than 12 Months | (32.3) | (1.1)
Fair Value, 12 Months or Longer | 27.0 | 0.0
Gross Unrealized Losses, 12 Months or Longer | (4.8) | 0.0
Fair Value, Total | 233.1 | 127.2
Gross Unrealized Losses, Total | (37.1) | (1.1)
Collateralized Loan Obligations |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 1,076.1 |
Gross Unrealized Losses, Less than 12 Months | (39.8) |
Fair Value, 12 Months or Longer | 29.0 |
Gross Unrealized Losses, 12 Months or Longer | (0.6) |
Fair Value, Total | 1,105.1 |
Gross Unrealized Losses, Total | (40.4) |
Corporate Debt Securities |  |
Available-for-Sale: |  |
Fair Value, Less than 12 Months | 144.0 | 109.9
Gross Unrealized Losses, Less than 12 Months | (10.4) | (3.3)
Fair Value, 12 Months or Longer | 95.0 | 20.9
Gross Unrealized Losses, 12 Months or Longer | (23.1) | (0.3)
Fair Value, Total | 239.0 | 130.8
Gross Unrealized Losses, Total | $ (33.5) | $ (3.6)

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