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Pension and Other Postretirement Benefits - Changes in Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Total recognized in other comprehensive (income) loss, after taxes | $ (34.9) | $ (3.4) | $ (20.7)
Pensions |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Current year net actuarial loss (gain) | (23.5) | 11.0 |
Amortization of net actuarial (loss) gain | (21.3) | (12.9) |
Amortization of prior service (cost) credit | (0.2) | (0.2) |
Settlement loss | (0.6) | (1.4) |
Total recognized in other comprehensive (income) loss, before taxes | (45.6) | (3.5) |
Total recognized in other comprehensive (income) loss, after taxes | (36.5) | (3.0) |
Other Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Current year net actuarial loss (gain) | 0.4 | (2.3) |
Amortization of net actuarial (loss) gain | 0.9 | 1.0 |
Amortization of prior service (cost) credit | 0.0 | (0.1) |
Settlement loss | 0.0 | 0.0 |
Total recognized in other comprehensive (income) loss, before taxes | 1.3 | (1.4) |
Total recognized in other comprehensive (income) loss, after taxes | $ 1.0 | $ (1.1) |

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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 17A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL34724391-108580 Reference 2: 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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e689-108580 Reference 4: 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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