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Employee Benefit Plans (Net Periodic Pension Costs Included in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
After-Tax Amount |  |  |
Prior service (cost) credit arising during the year | $ (19.1) | $ 10.0 | $ 0.3
Net (gain) loss recognized due to settlement | (0.4) | 0.1 | 0.3
Net loss recognized due to curtailment | 0.0 | 6.3 | 0.0
Net actuarial gain arising during the year | 12.3 | 53.6 | (32.7)
Amortization of prior service cost | 0.0 | 0.6 | 2.1
Amortization of net actuarial losses | 6.4 | 12.3 | 13.1
Defined Benefit Pension Plans |  |  |
After-Tax Amount |  |  |
Prior service (cost) credit arising during the year | (19.1) | 10.0 | 0.3
Net (gain) loss recognized due to settlement | (0.4) | 0.1 | 0.3
Net loss recognized due to curtailment |  | 6.3 |
Net actuarial gain arising during the year | 12.3 | 53.6 | (32.7)
Amortization of prior service cost |  | 0.6 | 2.1
Amortization of net actuarial losses | 6.4 | 12.3 | 13.1
Postretirement benefits |  |  |
Before-Tax Amount |  |  |
Accumulated other comprehensive loss, beginning of period | (2.1) |  |
Accumulated other comprehensive loss, end of period | (1.1) | (2.1) |
Net prior service cost | 3.1 | 3.2 |
Postretirement benefits | Defined Benefit Pension Plans |  |  |
Before-Tax Amount |  |  |
Accumulated other comprehensive loss, beginning of period | (302.4) | (412.5) |
Prior service credit arising during the year | (25.5) | 13.1 |
Net loss recognized due to settlement | (0.4) | 0.1 |
Net loss recognized due to curtailment |  | 8.5 |
Net actuarial gain arising during the year | 15.0 | 71.0 |
Amortization of prior service cost | 0.2 | 0.8 |
Amortization of net actuarial losses | 8.7 | 16.6 |
Accumulated other comprehensive loss, end of period | (304.4) | (302.4) | (412.5)
Income Tax |  |  |
Accumulated other comprehensive loss, beginning of period | (72.0) | (99.2) |
Prior service credit arising during the year | (6.4) | 3.1 |
Net loss recognized due to settlement | 0.0 | 0.0 |
Net loss recognized due to curtailment |  | 2.2 |
Net actuarial gain arising during the year | 2.7 | 17.4 |
Amortization of prior service cost | 0.2 | 0.2 |
Amortization of net actuarial losses | 2.3 | 4.3 |
Accumulated other comprehensive loss, end of period | (73.2) | (72.0) | (99.2)
After-Tax Amount |  |  |
Accumulated other comprehensive loss, , beginning of period | (230.4) | (313.3) |
Prior service (cost) credit arising during the year | (19.1) | 10.0 |
Net (gain) loss recognized due to settlement | (0.4) | 0.1 |
Net loss recognized due to curtailment |  | 6.3 |
Net actuarial gain arising during the year | 12.3 | 53.6 |
Amortization of prior service cost | 0.0 | 0.6 |
Amortization of net actuarial losses | 6.4 | 12.3 |
Accumulated other comprehensive loss, end of period | $ (231.2) | $ (230.4) | $ (313.3)

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