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Benefit Plans, Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Changes in Plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |
Amortization of prior service credit (gain) loss | $ (10.0) | $ (7.1) | $ (9.1)
Total recognized in other comprehensive income | 18.7 | 16.1 | $ (16.9)
Pension Benefits [Member] |  |  |
Changes in Plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |
Current year actuarial gain (loss) | (29.6) | (23.0) |
Amortization of actuarial (gain) loss | 10.5 | 7.7 |
Amortization of prior service credit (gain) loss | 0.0 | 0.0 |
Total recognized in other comprehensive income | (19.1) | (15.3) |
Post-Retirement Benefits [Member] |  |  |
Changes in Plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |
Current year actuarial gain (loss) | 0.9 | (0.2) |
Amortization of actuarial (gain) loss | (0.5) | (0.6) |
Amortization of prior service credit (gain) loss | 0.0 | 0.0 |
Total recognized in other comprehensive income | $ 0.4 | $ (0.8) |

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- Definition Amount, after tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 + Details
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