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Label Element Value
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 2,176,231,000
Revision of Prior Period, Adjustment [Member]  
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest (1,686,000) [1]
Parent [Member]  
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,728,964,000
Parent [Member] | Revision of Prior Period, Adjustment [Member]  
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest (1,686,000) [1]
Contributed Surplus [Member]  
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 200,000,000 [2]
Additional Paid-in Capital [Member]  
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,932,998,000
Additional Paid-in Capital [Member] | Revision of Prior Period, Adjustment [Member]  
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest (39,861,000) [1]
Retained Earnings [Member]  
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest (501,423,000)
Retained Earnings [Member] | Revision of Prior Period, Adjustment [Member]  
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 38,175,000 [1]
Common Stock [Member]  
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 108,223,000
AOCI Attributable to Parent [Member]  
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest (10,834,000) [3]
Noncontrolling Interest [Member]  
Equity, Including Portion Attributable to Noncontrolling Interest us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 447,267,000
[1] Opening adjustment to the December 31, 2021 equity relates to the adoption of ASU 2020-06 Debt – Debt with Conversion and Other Options (Topic 470) and Derivatives and Hedging - Contracts in Entity’s Own Equity (Topic 815), relating to an amendment to simplify an issuer’s accounting for convertible instruments, such convertible debt was derecognized in February 2022.
[2] Contributed Surplus is “capital” that can be returned to stockholders without the need to reduce share capital, thereby giving us greater flexibility when it comes to declaring dividends.
[3] As at September 30, 2023 and 2022, our other comprehensive income consisted of a gain of $1.5 million and $0.1 million of pension and post-retirement benefit plan adjustments and $0.2 million and $nil for our share of equity method investment’s comprehensive loss, respectively.