XML 63 R53.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component | Changes in accumulated other comprehensive income (loss) by component were as follows (in millions):
|  | Employee Pension and Postretirement Benefits, Net of Tax |  |  | Cumulative Translation Adjustments |  |  | Derivative Instruments, Net of Tax |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at September 30, 2020 |  | $ | (95.9 | ) |  | $ | (102.1 | ) |  | $ | (0.4 | ) |  | $ | (198.4 | )
Other comprehensive income (loss) before reclassifications |  |  | 57.1 |  |  |  | 3.8 |  |  |  | 1.5 |  |  |  | 62.4 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 4.6 |  |  |  | — |  |  |  | 0.4 |  |  |  | 5.0 |
Net current period other comprehensive income (loss) |  |  | 61.7 |  |  |  | 3.8 |  |  |  | 1.9 |  |  |  | 67.4 |
Balance at September 30, 2021 |  |  | (34.2 | ) |  |  | (98.3 | ) |  |  | 1.5 |  |  |  | (131.0 | )
Other comprehensive income (loss) before reclassifications |  |  | 8.2 |  |  |  | (6.9 | ) |  |  | 0.9 |  |  |  | 2.2 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 0.4 |  |  |  | — |  |  |  | (0.2 | ) |  |  | 0.2 |
Net current period other comprehensive income (loss) |  |  | 8.6 |  |  |  | (6.9 | ) |  |  | 0.7 |  |  |  | 2.4 |
Balance at December 31, 2021 |  |  | (25.6 | ) |  |  | (105.2 | ) |  |  | 2.2 |  |  |  | (128.6 | )
Other comprehensive income (loss) before reclassifications |  |  | 29.3 |  |  |  | (31.0 | ) |  |  | 6.2 |  |  |  | 4.5 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | 27.4 |  |  |  | 4.6 |  |  |  | (0.2 | ) |  |  | 31.8 |
Net current period other comprehensive income (loss) |  |  | 56.7 |  |  |  | (26.4 | ) |  |  | 6.0 |  |  |  | 36.3 |
Balance at December 31, 2022 |  |  | 31.1 |  |  |  | (131.6 | ) |  |  | 8.2 |  |  |  | (92.3 | )
Other comprehensive income (loss) before reclassifications |  |  | 3.5 |  |  |  | 24.2 |  |  |  | (0.5 | ) |  |  | 27.2 |
Amounts reclassified from accumulated other comprehensive income (loss) |  |  | (1.6 | ) |  |  | 2.9 |  |  |  | (8.2 | ) |  |  | (6.9 | )
Net current period other comprehensive income (loss) |  |  | 1.9 |  |  |  | 27.1 |  |  |  | (8.7 | ) |  |  | 20.3 |
Balance at December 31, 2023 |  | $ | 33.0 |  |  | $ | (104.5 | ) |  | $ | (0.5 | ) |  | $ | (72.0 | )
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Included in the Computation of Net Periodic Pension and Postretirement Benefit Cost | Reclassifications out of accumulated other comprehensive income (loss) included in the computation of net periodic pension and postretirement benefit cost (See Note 6 for additional details regarding employee benefit plans) were as follows (in millions):
|  | Classification of |  | Year Ended December 31, |  |  | (transition period) Three Months Ended December 31, |  |  | Year Ended September 30, |
|  | income (expense) |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | 2021 |
Amortization of employee pension and postretirement benefits items |
Prior service costs |  | Miscellaneous, net |  | $ | 0.5 |  |  | $ | 0.8 |  |  | $ | 0.2 |  |  | $ | 0.9 |
Settlement |  | Miscellaneous, net |  |  | — |  |  |  | 33.6 |  |  |  | — |  |  |  | — |
Actuarial (gains) losses |  | Miscellaneous, net |  |  | (2.6 | ) |  |  | 1.3 |  |  |  | 0.3 |  |  |  | 5.2 |
Total before tax |  |  |  |  | (2.1 | ) |  |  | 35.7 |  |  |  | 0.5 |  |  |  | 6.1 |
Tax benefit |  |  |  |  | 0.5 |  |  |  | (8.3 | ) |  |  | (0.1 | ) |  |  | (1.5 | )
Net of tax |  |  |  | $ | (1.6 | ) |  | $ | 27.4 |  |  | $ | 0.4 |  |  | $ | 4.6 |

X
- References No definition available. + Details
Name: | us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
Name: | us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481694/830-30-45-20 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration