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Retirement Benefits - Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maximum average weighted maturity (in years) | 10 years |  |
UMWA Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 139.0 | $ 178.0 | $ 168.0
% Actual Allocation | 100.00% | 100.00% |
% Target Allocation | 100.00% | 100.00% |
UMWA Plans | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 0.2 | $ 0.0 |
% Actual Allocation | 0.00% | 0.00% |
% Target Allocation | 0.00% | 0.00% |
UMWA Plans | U.S. large-cap(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 18.00% | 18.00% |
% Target Allocation | 22.00% | 19.00% |
UMWA Plans | U.S. large-cap(a) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 25.6 | $ 32.8 |
UMWA Plans | U.S. small/mid-cap(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 7.00% | 8.00% |
% Target Allocation | 10.00% | 8.00% |
UMWA Plans | U.S. small/mid-cap(a) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 10.0 | $ 13.8 |
UMWA Plans | International(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 20.00% | 23.00% |
% Target Allocation | 24.00% | 24.00% |
UMWA Plans | International(a) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 28.2 | $ 40.4 |
UMWA Plans | Emerging markets(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 4.00% | 4.00% |
% Target Allocation | 4.00% | 4.00% |
UMWA Plans | Emerging markets(a) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 4.9 | $ 6.7 |
UMWA Plans | Dynamic asset allocation(c) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 6.00% | 7.00% |
% Target Allocation | 7.00% | 7.00% |
UMWA Plans | Dynamic asset allocation(c) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 8.5 | $ 12.1 |
UMWA Plans | High yield(e) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 2.00% | 2.00% |
% Target Allocation | 2.00% | 2.00% |
UMWA Plans | High yield(e) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 2.4 | $ 3.5 |
UMWA Plans | Emerging markets(f) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 4.00% | 4.00% |
% Target Allocation | 4.00% | 4.00% |
UMWA Plans | Emerging markets(f) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 5.0 | $ 6.7 |
UMWA Plans | Multi asset real return(i) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 4.00% | 5.00% |
% Target Allocation | 5.00% | 5.00% |
UMWA Plans | Multi asset real return(i) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 6.1 | $ 8.6 |
UMWA Plans | Core property(g) (l) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 15.00% | 9.00% |
% Target Allocation | 10.00% | 10.00% |
UMWA Plans | Core property(g) (l) | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 20.6 | $ 16.6 |
UMWA Plans | Structured credit(h) (l) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 9.00% | 7.00% |
% Target Allocation | 5.00% | 5.00% |
UMWA Plans | Structured credit(h) (l) | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 12.8 | $ 13.1 |
UMWA Plans | Global private equity(j) (l) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 11.9 | $ 13.9 |
% Actual Allocation | 9.00% | 8.00% |
% Target Allocation | 7.00% | 7.00% |
UMWA Plans | Energy debt(k) (l) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 2.8 | $ 9.8 |
% Actual Allocation | 2.00% | 5.00% |
% Target Allocation | 0.00% | 5.00% |
Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maximum average weighted maturity (in years) | 5 years |  |
Minimum | Long duration - mutual fund(d) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portfolio duration (in years) | 10 years |  |
Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maximum average weighted maturity (in years) | 7 years |  |
Maximum | Long duration - mutual fund(d) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Portfolio duration (in years) | 15 years |  |
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 596.3 | $ 764.8 | 747.1
% Actual Allocation | 100.00% | 100.00% |
% Target Allocation | 100.00% | 100.00% |
U.S. Plans | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 3.8 | $ 3.9 |
% Actual Allocation | 0.00% | 0.00% |
% Target Allocation | 0.00% | 0.00% |
U.S. Plans | U.S. large-cap(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 15.00% | 20.00% |
% Target Allocation | 16.00% | 20.00% |
U.S. Plans | U.S. large-cap(a) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 90.2 | $ 150.4 |
U.S. Plans | U.S. small/mid-cap(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 5.00% | 7.00% |
% Target Allocation | 5.00% | 7.00% |
U.S. Plans | U.S. small/mid-cap(a) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 27.9 | $ 52.4 |
U.S. Plans | International(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 17.00% | 21.00% |
% Target Allocation | 17.00% | 22.00% |
U.S. Plans | International(a) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 99.2 | $ 162.5 |
U.S. Plans | Emerging markets(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 2.00% | 4.00% |
% Target Allocation | 2.00% | 4.00% |
U.S. Plans | Emerging markets(a) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 11.5 | $ 29.0 |
U.S. Plans | Dynamic asset allocation(c) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 5.00% | 7.00% |
% Target Allocation | 5.00% | 7.00% |
U.S. Plans | Dynamic asset allocation(c) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 28.1 | $ 52.5 |
U.S. Plans | Long duration - mutual fund(d) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 44.00% | 29.00% |
% Target Allocation | 45.00% | 30.00% |
U.S. Plans | Long duration - mutual fund(d) | Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 189.4 | $ 186.7 |
U.S. Plans | Long duration - Treasury strips(d) | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 74.9 | $ 38.3 |
U.S. Plans | Core property(g) (l) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 6.00% | 6.00% |
% Target Allocation | 5.00% | 5.00% |
U.S. Plans | Core property(g) (l) | Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 36.2 | $ 43.7 |
U.S. Plans | Structured credit(h) (l) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
% Actual Allocation | 6.00% | 6.00% |
% Target Allocation | 5.00% | 5.00% |
U.S. Plans | Structured credit(h) (l) | Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 35.1 | $ 45.4 |
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 245.5 | $ 360.3 | $ 355.8
% Actual Allocation | 100.00% | 100.00% |
% Target Allocation | 100.00% | 100.00% |
Non-U.S. Plans | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 0.7 | $ 0.8 |
% Actual Allocation | 0.00% | 0.00% |
% Target Allocation | 0.00% | 0.00% |
Non-U.S. Plans | Equity securities: |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 30.0 | $ 75.4 |
% Actual Allocation | 12.00% | 21.00% |
% Target Allocation | 13.00% | 18.00% |
Non-U.S. Plans | U.S. equity funds(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 9.6 | $ 22.8 |
Non-U.S. Plans | Canadian equity funds(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | 3.6 | 9.6 |
Non-U.S. Plans | European equity funds(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | 1.4 | 4.5 |
Non-U.S. Plans | Other global equity funds(a) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | 15.4 | 38.5 |
Non-U.S. Plans | Fixed-income securities: |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 113.9 | $ 149.3 |
% Actual Allocation | 47.00% | 42.00% |
% Target Allocation | 47.00% | 44.00% |
Non-U.S. Plans | Long duration - mutual fund(d) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 59.5 | $ 63.9 |
Non-U.S. Plans | High yield(e) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | 0.7 | 2.0 |
Non-U.S. Plans | Emerging markets(f) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | 0.7 | 2.1 |
Non-U.S. Plans | Canadian fixed-income securities(b) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | 42.0 | 71.5 |
Non-U.S. Plans | European fixed-income funds(c) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | 11.0 | 9.8 |
Non-U.S. Plans | Other types of investments: |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 100.9 | $ 134.8 |
% Actual Allocation | 10.00% | 7.00% |
% Target Allocation | 7.00% | 6.00% |
Non-U.S. Plans | Guaranteed contract value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 75.8 | $ 109.7 |
% Actual Allocation | 31.00% | 30.00% |
% Target Allocation | 33.00% | 32.00% |
Non-U.S. Plans | Property funds(h) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 9.6 | $ 9.4 |
Non-U.S. Plans | Global infrastructure fund(i) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | 6.8 | 9.7 |
Non-U.S. Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total Fair Value | $ 8.7 | $ 6.0 |

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