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Investment Securities - Investment Securities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | $ 3,436.6 | $ 3,101.8
Accumulated gross unrealized gain, current | 14.7 | 23.8
Accumulated gross unrealized loss, current | 128.8 | 103.5
Debt securities, current | 3,322.5 | 3,022.1
Amortized cost, non-current | 70.8 | 70.6
Accumulated gross unrealized gain, non-current | 0.2 | 0.6
Accumulated gross unrealized loss, non-current | 5.2 | 4.4
Fair value | 65.7 | 66.8
Amortized Cost | 3,507.4 | 3,172.4
Total Unrealized Gains | 14.9 | 24.4
Total Unrealized Losses | 134.0 | 107.9
Fair value | 3,388.2 | 3,088.9
Executive deferred compensation plan trust | 15.6 | 13.7
Asset Pledged as Collateral |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of debt securities pledged | 82.5 |
Asset Pledged as Collateral | FHLB advances | Federal Reserve Bank Advances |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of debt securities pledged | 360.4 |
Asset Pledged as Collateral | Borrowed federal funds | Federal Reserve Bank Advances |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value of debt securities pledged | 699.2 |
Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, non-current | 28.5 | 28.6
Accumulated gross unrealized gain, non-current | 0.2 | 0.6
Accumulated gross unrealized loss, non-current | 1.3 | 0.8
Debt securities | 27.4 | 28.4
U.S. treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 429.9 | 410.1
Accumulated gross unrealized gain, current | 0.1 | 0.8
Accumulated gross unrealized loss, current | 35.0 | 32.3
Debt securities, current | 395.1 | 378.6
Corporate and sovereign debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 1,227.5 | 1,086.8
Accumulated gross unrealized gain, current | 5.5 | 13.6
Accumulated gross unrealized loss, current | 35.3 | 31.6
Debt securities, current | 1,197.6 | 1,068.8
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 70.9 | 70.8
Accumulated gross unrealized gain, current | 0.2 | 0.3
Accumulated gross unrealized loss, current | 5.8 | 5.4
Debt securities, current | 65.4 | 65.7
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 668.0 | 582.6
Accumulated gross unrealized gain, current | 5.9 | 3.2
Accumulated gross unrealized loss, current | 2.7 | 4.2
Debt securities, current | 671.2 | 581.6
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost, current | 1,040.3 | 951.5
Accumulated gross unrealized gain, current | 2.9 | 5.9
Accumulated gross unrealized loss, current | 50.0 | 30.0
Debt securities, current | 993.2 | 927.4
Mutual fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities FV-NI cost, non-current | 29.4 | 29.1
Accumulated gross unrealized gain, non-current | 0.0 | 0.0
Accumulated gross unrealized loss, non-current | 3.9 | 3.6
Equity securities, FV-NI, noncurrent | 25.4 | 25.5
Pooled investment fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities FV-NI cost, non-current | 12.9 | 12.9
Accumulated gross unrealized gain, non-current | 0.0 | 0.0
Accumulated gross unrealized loss, non-current | 0.0 | 0.0
Equity securities, FV-NI, noncurrent | $ 12.9 | $ 12.9

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