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Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Available-for-Sale: |  |  |  |  |  |
Fair Value, Less than 12 Months | $ 1,114.2 |  | $ 5,071.9 |  |  |
Gross Unrealized Losses, Less than 12 Months | (67.0) |  | (346.6) |  |  |
Fair Value, 12 Months or Longer | 4,731.7 |  | 1,545.6 |  |  |
Gross Unrealized Losses, 12 Months or Longer | (523.5) |  | (283.1) |  |  |
Fair Value, Total | 5,845.9 |  | 6,617.5 |  |  |
Gross Unrealized Losses, Total | (590.5) |  | (629.7) |  |  |
Allowance for Credit Losses | (1.4) | $ (2.6) | 0.0 | $ 0.0 | $ 0.0 | $ 0.0
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 6,448.2 |  | 7,573.5 |  |  |
Gross Unrealized Gains | 0.2 |  | 2.3 |  |  |
Gross Unrealized Losses | (590.5) |  | (629.7) |  |  |
Estimated Fair Value | 5,857.9 |  | 6,946.1 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 6,449.6 |  | 7,573.5 |  |  |
Investment securities classified as held to maturity | 3,318.4 |  | 3,453.7 |  |  |
Allowance for Credit Losses | (0.7) | $ (0.7) | (1.9) | $ (1.6) | $ (1.6) | $ 0.0
Net Amortized Cost | 3,317.7 |  | 3,451.8 |  |  |
Gross Unrealized Gains | 0.4 |  | 0.4 |  |  |
Gross Unrealized Losses | (393.4) |  | (400.0) |  |  |
Investment debt securities held-to-maturity | 2,924.7 |  | 3,052.2 |  |  |
US Treasury Notes Securities |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Fair Value, Less than 12 Months | 47.2 |  |  |  |  |
Gross Unrealized Losses, Less than 12 Months | (2.3) |  |  |  |  |
Fair Value, 12 Months or Longer | 171.9 |  |  |  |  |
Gross Unrealized Losses, 12 Months or Longer | (28.7) |  |  |  |  |
Fair Value, Total | 219.1 |  |  |  |  |
Gross Unrealized Losses, Total | (31.0) |  |  |  |  |
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 |  | 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 | (31.0) |  | (34.5) |  |  |
Estimated Fair Value | 219.1 |  | 642.7 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 250.1 |  | 675.1 |  |  |
Investment securities classified as held to maturity | 397.8 |  | 396.6 |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Net Amortized Cost | 397.8 |  | 396.6 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | (8.9) |  | (10.2) |  |  |
Investment debt securities held-to-maturity | 388.9 |  | 386.4 |  |  |
State, county, and municipal securities |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Fair Value, Less than 12 Months | 9.0 |  | 104.9 |  |  |
Gross Unrealized Losses, Less than 12 Months | (0.4) |  | (9.0) |  |  |
Fair Value, 12 Months or Longer | 204.0 |  | 146.1 |  |  |
Gross Unrealized Losses, 12 Months or Longer | (42.8) |  | (41.6) |  |  |
Fair Value, Total | 213.0 |  | 251.0 |  |  |
Gross Unrealized Losses, Total | (43.2) |  | (50.6) |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 258.1 |  | 314.3 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | (43.2) |  | (50.6) |  |  |
Estimated Fair Value | 214.9 |  | 263.7 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 258.1 |  | 314.3 |  |  |
Investment securities classified as held to maturity | 180.5 |  | 181.2 |  |  |
Allowance for Credit Losses | 0.0 |  | (0.1) |  |  |
Net Amortized Cost | 180.5 |  | 181.1 |  |  |
Gross Unrealized Gains | 0.2 |  | 0.2 |  |  |
Gross Unrealized Losses | (27.0) |  | (31.6) |  |  |
Investment debt securities held-to-maturity | 153.7 |  | 149.7 |  |  |
Obligations of U.S. government agencies |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Fair Value, Less than 12 Months | 60.6 |  | 152.2 |  |  |
Gross Unrealized Losses, Less than 12 Months | (3.1) |  | (10.1) |  |  |
Fair Value, 12 Months or Longer | 111.0 |  | 46.1 |  |  |
Gross Unrealized Losses, 12 Months or Longer | (11.3) |  | (7.2) |  |  |
Fair Value, Total | 171.6 |  | 198.3 |  |  |
Gross Unrealized Losses, Total | (14.4) |  | (17.3) |  |  |
Allowance for Credit Losses | 0.0 |  | 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 | (14.4) |  | (17.3) |  |  |
Estimated Fair Value | 172.0 |  | 198.9 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 186.4 |  | 216.2 |  |  |
Investment securities classified as held to maturity | 353.1 |  | 351.7 |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Net Amortized Cost | 353.1 |  | 351.7 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | (48.9) |  | (49.6) |  |  |
Investment debt securities held-to-maturity | 304.2 |  | 302.1 |  |  |
Private mortgage-backed securities |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Fair Value, Less than 12 Months | 0.0 |  | 133.1 |  |  |
Gross Unrealized Losses, Less than 12 Months | 0.0 |  | (19.1) |  |  |
Fair Value, 12 Months or Longer | 217.1 |  | 94.9 |  |  |
Gross Unrealized Losses, 12 Months or Longer | (36.4) |  | (17.8) |  |  |
Fair Value, Total | 217.1 |  | 228.0 |  |  |
Gross Unrealized Losses, Total | (36.4) |  | (36.9) |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 253.5 |  | 264.9 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | (36.4) |  | (36.9) |  |  |
Estimated Fair Value | 217.1 |  | 228.0 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 253.5 |  | 264.9 |  |  |
Collateralized Loan Obligations |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Fair Value, Less than 12 Months | 0.0 |  | 1,082.6 |  |  |
Gross Unrealized Losses, Less than 12 Months | 0.0 |  | (33.1) |  |  |
Fair Value, 12 Months or Longer | 1,124.3 |  | 28.9 |  |  |
Gross Unrealized Losses, 12 Months or Longer | (17.5) |  | (0.5) |  |  |
Fair Value, Total | 1,124.3 |  | 1,111.5 |  |  |
Gross Unrealized Losses, Total | (17.5) |  | (33.6) |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 1,141.8 |  | 1,145.2 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | (17.5) |  | (33.6) |  |  |
Estimated Fair Value | 1,124.3 |  | 1,111.6 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 1,141.8 |  | 1,145.2 |  |  |
Corporate Debt Securities |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Fair Value, Less than 12 Months | 16.3 |  | 130.6 |  |  |
Gross Unrealized Losses, Less than 12 Months | (0.9) |  | (8.3) |  |  |
Fair Value, 12 Months or Longer | 211.2 |  | 110.8 |  |  |
Gross Unrealized Losses, 12 Months or Longer | (31.7) |  | (22.5) |  |  |
Fair Value, Total | 227.5 |  | 241.4 |  |  |
Gross Unrealized Losses, Total | (32.6) |  | (30.8) |  |  |
Allowance for Credit Losses | (1.4) |  | 0.0 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 260.1 |  | 272.3 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | (32.6) |  | (30.8) |  |  |
Estimated Fair Value | 227.5 |  | 241.5 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 261.5 |  | 272.3 |  |  |
Investment securities classified as held to maturity | 57.1 |  | 80.1 |  |  |
Allowance for Credit Losses | (0.7) |  | (1.8) |  |  |
Net Amortized Cost | 56.4 |  | 78.3 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | (7.8) |  | (7.0) |  |  |
Investment debt securities held-to-maturity | 48.6 |  | 71.3 |  |  |
Commercial Mortgage-Backed Securities |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Fair Value, Less than 12 Months | 396.0 |  | 1,069.8 |  |  |
Gross Unrealized Losses, Less than 12 Months | (23.7) |  | (59.9) |  |  |
Fair Value, 12 Months or Longer | 696.8 |  | 270.8 |  |  |
Gross Unrealized Losses, 12 Months or Longer | (87.0) |  | (57.0) |  |  |
Fair Value, Total | 1,092.8 |  | 1,340.6 |  |  |
Gross Unrealized Losses, Total | (110.7) |  | (116.9) |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 1,212.9 |  | 1,468.0 |  |  |
Gross Unrealized Gains | 0.2 |  | 0.2 |  |  |
Gross Unrealized Losses | (110.7) |  | (117.0) |  |  |
Estimated Fair Value | 1,102.4 |  | 1,351.2 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 1,212.9 |  | 1,468.0 |  |  |
Investment securities classified as held to maturity | 517.8 |  | 526.8 |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Net Amortized Cost | 517.8 |  | 526.8 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | (61.4) |  | (58.3) |  |  |
Investment debt securities held-to-maturity | 456.4 |  | 468.5 |  |  |
Residential Mortgage Backed Securities |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Fair Value, Less than 12 Months | 272.5 |  | 1,213.5 |  |  |
Gross Unrealized Losses, Less than 12 Months | (15.7) |  | (112.3) |  |  |
Fair Value, 12 Months or Longer | 1,102.8 |  | 344.6 |  |  |
Gross Unrealized Losses, 12 Months or Longer | (143.4) |  | (55.4) |  |  |
Fair Value, Total | 1,375.3 |  | 1,558.1 |  |  |
Gross Unrealized Losses, Total | (159.1) |  | (167.7) |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 1,534.5 |  | 1,726.0 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | (159.1) |  | (167.7) |  |  |
Estimated Fair Value | 1,375.4 |  | 1,558.3 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 1,534.5 |  | 1,726.0 |  |  |
Investment securities classified as held to maturity | 1,311.4 |  | 1,391.5 |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Net Amortized Cost | 1,311.4 |  | 1,391.5 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | (160.7) |  | (166.6) |  |  |
Investment debt securities held-to-maturity | 1,150.7 |  | 1,224.9 |  |  |
Collateralized Mortgage Obligations |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Fair Value, Less than 12 Months | 312.6 |  | 1,016.4 |  |  |
Gross Unrealized Losses, Less than 12 Months | (20.9) |  | (90.1) |  |  |
Fair Value, 12 Months or Longer | 892.6 |  | 333.0 |  |  |
Gross Unrealized Losses, 12 Months or Longer | (124.7) |  | (51.3) |  |  |
Fair Value, Total | 1,205.2 |  | 1,349.4 |  |  |
Gross Unrealized Losses, Total | (145.6) |  | (141.4) |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss | 1,350.8 |  | 1,491.5 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | (145.6) |  | (141.3) |  |  |
Estimated Fair Value | 1,205.2 |  | 1,350.2 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 1,350.8 |  | 1,491.5 |  |  |
Investment securities classified as held to maturity | 500.7 |  | 525.8 |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Net Amortized Cost | 500.7 |  | 525.8 |  |  |
Gross Unrealized Gains | 0.2 |  | 0.2 |  |  |
Gross Unrealized Losses | (78.7) |  | (76.7) |  |  |
Investment debt securities held-to-maturity | 422.2 |  | 449.3 |  |  |
Other investments |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Allowance for Credit Losses | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, after Allowance for Credit Loss |  |  | 0.0 |  |  |
Gross Unrealized Gains | 0.0 |  | 0.0 |  |  |
Gross Unrealized Losses | 0.0 |  | 0.0 |  |  |
Estimated Fair Value | 0.0 |  | 0.0 |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss | 0.0 |  | 0.0 |  |  |
Other Investments |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Investment securities classified as held to maturity |  |  | 0.0 |  |  |
Allowance for Credit Losses |  |  | 0.0 |  |  |
Net Amortized Cost |  |  | 0.0 |  |  |
Gross Unrealized Gains |  |  | 0.0 |  |  |
Gross Unrealized Losses |  |  | 0.0 |  |  |
Investment debt securities held-to-maturity |  |  | 0.0 |  |  |
Other Security Investments |  |  |  |  |  |
Available-for-Sale: |  |  |  |  |  |
Fair Value, Less than 12 Months | 0.0 |  |  |  |  |
Gross Unrealized Losses, Less than 12 Months | 0.0 |  |  |  |  |
Fair Value, 12 Months or Longer | 0.0 |  |  |  |  |
Gross Unrealized Losses, 12 Months or Longer | 0.0 |  |  |  |  |
Fair Value, Total | 0.0 |  |  |  |  |
Gross Unrealized Losses, Total | $ 0.0 |  |  |  |  |
Investment securities classified as held to maturity |  |  | $ 0.0 |  |  |

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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