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Pension and Other Postretirement Benefits - Changes in Plan Assets & Benefit Obligation Recognized in OCI (pre-taxed) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net loss (gain) | $ 13.4 | $ 12.7 | $ 6.8
Prior service cost (benefit) | 0.0 | 0.0 | 0.6
Amortization of prior service (cost) benefit, including recognition due to curtailment | 3.0 | 4.8 | 7.1
Pension |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net loss (gain) | 10.8 | 12.6 |
Prior service cost (benefit) | 0.0 | 0.0 |
Amortization of net loss, including recognition due to settlement | (6.5) | (6.6) |
Amortization of prior service (cost) benefit, including recognition due to curtailment | (0.1) | (0.1) |
Total amount recognized in other comprehensive loss | 4.2 | 5.9 |
Net periodic benefit cost | 2.1 | 5.7 | 0.9
Total recognized in net periodic benefit cost and other comprehensive loss | 6.3 | 11.6 |
OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net loss (gain) | 2.7 | 0.1 |
Prior service cost (benefit) | 0.0 | 0.0 |
Amortization of net loss, including recognition due to settlement | (2.2) | (2.3) |
Amortization of prior service (cost) benefit, including recognition due to curtailment | 3.2 | 4.9 |
Total amount recognized in other comprehensive loss | 3.7 | 2.7 |
Net periodic benefit cost | 2.3 | 2.1 | $ 1.2
Total recognized in net periodic benefit cost and other comprehensive loss | $ 6.0 | $ 4.8 |

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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation 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 (j) -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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