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Pension and Other Postretirement Benefits - Funded status of plans (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Non-current assets | $ 0.0 | $ 0.0
Current liabilities | (10.3) | (10.4)
Pension |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status | (67.0) | (62.6)
Current liabilities | (1.8) | (1.8)
Non-current liabilities | (65.2) | (60.8)
Net amount recognized | (67.0) | (62.6)
Net loss | 94.0 | 89.7
Prior service cost (benefit) | 1.1 | 1.2
Total | 95.1 | 90.9
Projected benefit obligation for plans with accumulated benefit obligations in excess of plan assets | 385.8 | 358.4
Accumulated benefit obligation for plans with accumulated benefit obligations in excess of plan assets | 379.4 | 352.2
Fair value of plan assets for plans with accumulated benefit obligations in excess of plan assets | 318.8 | 295.9
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status | (107.9) | (107.7)
Current liabilities | (6.4) | (7.1)
Non-current liabilities | (101.5) | (100.7)
Net amount recognized | (107.9) | (107.8)
Net loss | 42.2 | 41.7
Prior service cost (benefit) | (13.5) | (16.7)
Total | $ 28.7 | $ 25.0

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) 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 (j) -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 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for 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 (j) -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 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109237824&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: 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 + Details
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