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Retirement Benefits - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 01, 2020 | Dec. 31, 2022 | Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated contributions |  | $ 9.6 |
Discount percent |  | 50.00% |
Defined contribution plan maximum annual contribution per employee percent | 2.00% |  | 2.00%
Private Equity Funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unfunded commitments |  | $ 4.0 |
Structured credit(h) (l) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Required notice |  | 65 days |
Hedge fund of funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Required notice |  | 95 days |
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation |  | $ 627.2 | $ 839.5
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated benefit obligation |  | 304.2 | $ 448.2
Estimated contributions |  | 8.1 |
Nonqualified U.S. pension plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Estimated contributions |  | $ 0.6 |
UMWA Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Black lung health care cost trend rate |  | 7.00% | 5.80%
Black lung health care cost ultimate rate |  | 5.00% | 5.00%
UMWA Plans | Energy debt(k) (l) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Lockup provision |  | 3 years |
Black Lung and Other Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Black lung health care cost ultimate rate |  | 5.00% |
Canada Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Black lung health care cost trend rate |  | 7.00% |
Black lung health care cost ultimate rate |  | 5.00% |
Brazil Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Black lung health care cost trend rate |  | 4.80% |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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