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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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