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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Actuarial Losses [Roll Forward] |  |  |
Net change in defined benefit plans arising during the period | $ 12.2 | $ (0.9) | $ 14.9
Amortization of net actuarial (gains) losses and prior service costs included in compensation and benefits expense | 0.1 | 0.1 | $ 1.2
Pension Plans [Member] |  |  |
Actuarial Losses [Roll Forward] |  |  |
Actuarial Loss Beginning Balance | 33.0 |  |
Net change in defined benefit plans arising during the period | (0.4) |  |
Amortization of net actuarial (gains) losses and prior service costs included in compensation and benefits expense | (11.8) |  |
Actuarial Loss Ending Balance | $ 20.8 | $ 33.0 |

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