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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
After-Tax Amount |  |  |
Prior service credit (cost) arising during the year | $ 0.3 | $ (4.7) | $ (7.0)
Net loss recognized due to settlement | 0.3 | 0.6 | 0.9
Net actuarial (loss) gain arising during the year, after tax | (32.7) | (23.3) | (4.2)
Amortization of prior service costs, after tax | 2.1 | 1.6 | 1.3
Amortization of net actuarial losses included in net periodic pension cost | 13.1 | 11.8 | 11.7
Defined Benefit Pension Plans |  |  |
After-Tax Amount |  |  |
Prior service credit (cost) arising during the year | 0.3 | (4.7) | (7.0)
Net loss recognized due to settlement | 0.3 | 0.6 | 0.9
Net actuarial (loss) gain arising during the year, after tax | (32.7) | (23.3) | (4.2)
Amortization of prior service costs, after tax | 2.1 | 1.6 | 1.3
Amortization of net actuarial losses included in net periodic pension cost | 13.1 | 11.8 | 11.7
Other Postretirement Benefits Plan [Member] |  |  |
Before-Tax Amount |  |  |
Accumulated other comprehensive loss, before tax, beginning of period | (3.9) |  |
Accumulated other comprehensive loss, before tax, end of period | (2.6) | (3.9) |
Other Postretirement Benefits Plan [Member] | Defined Benefit Pension Plans |  |  |
Before-Tax Amount |  |  |
Accumulated other comprehensive loss, before tax, beginning of period | (393.2) | (379.8) |
Prior service cost arising during the year, before tax | 0.3 | (4.7) |
Net loss recognized due to settlement, before tax | 0.3 | 0.6 |
Net actuarial (loss) gain arising during the year, before tax | (37.8) | (25.3) |
Amortization of prior service cost, before tax | 2.2 | 1.7 |
Amortization of net actuarial losses | 15.7 | 14.3 |
Accumulated other comprehensive loss, before tax, end of period | (412.5) | (393.2) | (379.8)
Income Tax |  |  |
Accumulated other comprehensive loss, tax, beginning of period | (96.8) | (97.4) |
Prior service cost arising during the year, tax | 0.0 | 0.0 |
Net loss recognized due to settlement, tax | 0.0 | 0.0 |
Net actuarial (loss) gain arising during the year, tax | (5.1) | (2.0) |
Amortization of prior service costs, tax | 0.1 | 0.1 |
Amortization of net actuarial losses, tax | 2.6 | 2.5 |
Accumulated other comprehensive loss, tax, end of period | (99.2) | (96.8) | (97.4)
After-Tax Amount |  |  |
Accumulated other comprehensive loss, after tax, beginning of period | (296.4) | (282.4) |
Prior service credit (cost) arising during the year | 0.3 | (4.7) |
Net loss recognized due to settlement | 0.3 | 0.6 |
Net actuarial (loss) gain arising during the year, after tax | (32.7) | (23.3) |
Amortization of prior service costs, after tax | 2.1 | 1.6 |
Amortization of net actuarial losses included in net periodic pension cost | 13.1 | 11.8 |
Accumulated other comprehensive loss, after tax, end of period | $ (313.3) | $ (296.4) | $ (282.4)

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