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Employee Benefit Plans (Accumulated Other Comprehensive Income (Loss), of the Prior Service Costs and Actuarial Losses) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Actuarial Losses [Roll Forward] |  |  |
Net change in defined benefit plans arising during the period | $ (0.9) | $ 14.9 | $ 25.5
Amortization of net actuarial (gains) losses and prior service costs included in compensation and benefits expense | 0.1 | 1.2 | $ 4.4
Pension Plans [Member] |  |  |
Actuarial Losses [Roll Forward] |  |  |
Actuarial Loss Beginning Balance | 32.2 |  |
Net change in defined benefit plans arising during the period | 1.1 |  |
Amortization of net actuarial (gains) losses and prior service costs included in compensation and benefits expense | (0.3) |  |
Actuarial Loss Ending Balance | $ 33.0 | $ 32.2 |

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