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Long-Term Debt - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 16, 2018 USD ($) | Jun. 30, 2025 USD ($) | Feb. 28, 2025 USD ($) | Apr. 30, 2024 USD ($) | May 31, 2021 USD ($) | May 31, 2020 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2022 USD ($) Days $ / shares | Dec. 31, 2024 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  | $ 2,079.1 |  |  | $ 2,079.1 |  |  |  |  |
Credit facility, amount borrowed |  |  |  |  |  |  |  |  |  |  | $ 1,144.5 |  |  |  |
Gain on extinguishment of debt |  |  |  |  |  |  |  |  |  | 0.0 | (10.5) |  |  |  |
Interest expense |  |  |  |  |  |  | 53.0 | $ 59.4 |  | 163.0 | 161.4 |  |  |  |
Letters of credit issued but undrawn |  |  |  |  |  |  | 148.0 |  |  | 148.0 |  |  |  |  |
4.250% Convertible Senior Notes Due 2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  | 277.5 |  |  | 277.5 |  | $ 277.5 | $ 277.5 |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  | 8.5 |  |  |
Aggregate principal amount of senior notes issued |  |  |  |  |  |  |  |  |  |  |  | 250.0 |  |  |
Convertible debt underwriters over allotment option fully exercised |  |  |  |  |  |  |  |  |  |  |  | 37.5 |  |  |
Interest expense |  |  |  |  |  |  | 3.4 | 3.3 |  | 10.0 | 10.6 |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  | $ 0.3 | 0.4 |  | $ 1.1 | 1.1 |  |  |  |
Additional principal amount of convertible notes |  |  |  |  |  |  |  |  |  |  |  | $ 27.5 |  |  |
Convertible notes, interest rate |  |  |  |  |  |  | 4.25% |  |  | 4.25% |  | 4.25% |  |  |
Line of credit maturity |  |  |  |  |  |  |  |  |  | Jun. 15, 2028 |  | Jun. 15, 2028 |  |  |
Principal amount of convertible notes |  |  |  |  |  |  |  |  |  |  |  | $ 1,000.0 |  |  |
Convertible notes conversion rate |  |  |  |  |  |  |  |  |  |  |  | 58.8998 |  |  |
Convertible notes conversion price | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 16.98 |  |  |
Effective interest rate on convertible notes |  |  |  |  |  |  |  |  |  |  |  | 4.90% |  |  |
Fair value of liability to convertible notes |  |  |  |  |  |  | $ 262.1 |  |  | $ 262.1 |  |  | 215.3 |  |
Convertible notes, conversion feature |  |  |  |  |  |  |  |  |  | Holders of the 2028 Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending March 31, 2023, if the last reported sale price of the Company’s common shares for at least 20 trading days (whether or not consecutive) in a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price for the 2028 Convertible Notes on each applicable trading day; (ii) during the five business-day period immediately after any five consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of 2028 Convertible Notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company’s common shares and the conversion rate for the 2028 Convertible Notes for each such day; (iii) if the Company calls the 2028 Convertible Notes for redemption; or (iv) upon the occurrence of specified corporate events. On and after March 15, 2028, holders may convert their 2028 Convertible Notes at any time, regardless of the foregoing circumstances. |  |  |  |  |
Convertible notes, number of trading days of threshold limit (whether or not consecutive) | Days |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |
Convertible notes, number of trading days of threshold limit in consecutive days | Days |  |  |  |  |  |  |  |  |  |  |  | 30 |  |  |
Minimum percentage of common share price over conversion price for conversion |  |  |  |  |  |  |  |  |  |  |  | 130.00% |  |  |
Minimum percentage of the product of common share price and conversion rate for convertible notes |  |  |  |  |  |  |  |  |  |  |  | 98.00% |  |  |
Unamortized debt discount and debt issuance costs |  |  |  |  |  |  | 4.5 |  |  | $ 4.5 |  |  | 5.6 |  |
Convertible senior notes, carrying value |  |  |  |  |  |  | 273.0 |  |  | 273.0 |  |  | 271.9 |  |
7.875% Senior Notes Due 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  |  |  |  |  |  |  | 262.3 |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  | 0.5 |  | $ 7.9
Aggregate principal amount of senior notes issued |  | $ 50.0 | $ 65.0 | $ 300.0 |  | $ 600.0 | 147.3 |  |  | 147.3 |  |  |  |  |
Debt instrument , Purchase Price |  | 51.3 | 67.3 | 309.1 |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  | $ 1.3 | $ 2.3 | 3.2 |  |  | 5.8 |  |  | 5.8 |  |  |  |  |
Reduction to long term debt |  |  |  | 298.8 |  |  |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt |  |  |  | 7.1 |  |  |  |  | $ 0.9 |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | 2.0 | 5.3 |  | 10.8 | 24.3 |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  | $ 0.0 | 0.2 |  | $ 0.5 | 0.8 |  |  |  |
Convertible notes, interest rate |  |  |  |  |  | 7.875% | 7.875% |  |  | 7.875% |  |  |  |  |
Line of credit maturity |  |  |  |  |  | Sep. 01, 2025 |  |  |  | Jan. 09, 2025 |  |  |  |  |
Carrying amount |  |  |  |  |  |  | $ 0.0 |  |  | $ 0.0 |  |  | 261.8 |  |
7.875% Senior Notes Due 2025 [Member] | Debt Issuance Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.9
7.875% Senior Notes Due 2025 [Member] | Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  |  |  |  |  |  |  |  |  |  | 263.0 |  |
4.875% Senior Notes Due 2029 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  | 600.0 |  |  | 600.0 |  |  | 600.0 |  |
Deferred financing costs |  |  |  |  |  |  | 3.9 |  |  | 3.9 |  |  | 4.6 | $ 7.7 |
Aggregate principal amount of senior notes issued |  |  |  |  | $ 600.0 |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | 7.6 | 7.5 |  | 22.7 | 22.6 |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  | $ 0.2 | 0.2 |  | $ 0.7 | 0.7 |  |  |  |
Convertible notes, interest rate |  |  |  |  | 4.875% |  | 4.875% |  |  | 4.875% |  |  |  |  |
Line of credit maturity |  |  |  |  | Jun. 01, 2029 |  |  |  |  | Jan. 06, 2029 |  |  |  |  |
Carrying amount |  |  |  |  |  |  | $ 596.1 |  |  | $ 596.1 |  |  | 595.4 |  |
Fair value of notes |  |  |  |  |  |  | 529.2 |  |  | 529.2 |  |  | 421.5 |  |
4.875% Senior Notes Due 2029 [Member] | Debt Issuance Costs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7.7 |
Twelve Point Two Five Zero Percentage Senior Secured Notes Due Two Thousand and Twenty Nine [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount |  |  |  |  |  |  | 800.0 |  |  | 800.0 |  |  | 800.0 |  |
Deferred financing costs |  |  |  | 13.9 |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of senior notes issued |  |  |  | $ 800.0 |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | 26.0 | 25.8 |  | 77.8 | 48.4 |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  | 0.6 | 0.5 |  | 1.7 | 0.9 |  |  |  |
Convertible notes, interest rate |  |  |  | 12.25% |  |  |  |  |  |  |  |  |  |  |
Line of credit maturity |  |  |  | Apr. 15, 2029 |  |  |  |  |  |  |  |  |  |  |
Unamortized debt discount and debt issuance costs |  |  |  |  |  |  | 27.5 |  |  | 27.5 |  |  | 31.8 |  |
Fair value of notes |  |  |  |  |  |  | 873.2 |  |  | $ 873.2 |  |  | $ 851.3 |  |
SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate interest rate floor |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |
2018 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit maturity |  |  |  |  |  |  |  |  |  | Mar. 19, 2025 |  |  |  |  |
2018 Term Loan A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit maturity |  |  |  |  |  |  |  |  |  | Mar. 19, 2025 |  |  |  |  |
2018 Term Loan A [Member] | 2018 Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |
2018 Term Loan A [Member] | 2018 Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  |  |  |  |  | 1.25% |  |  |  |  |
2018 Term Loan A [Member] | 2018 Revolving Credit Facility [Member] | SOFR | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |
2018 Term Loan A [Member] | 2018 Revolving Credit Facility [Member] | SOFR | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |
2018 Term Loan B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit maturity |  |  |  |  |  |  |  |  |  | Aug. 18, 2025 |  |  |  |  |
Separately 2025 Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount of senior notes issued |  |  |  | $ 37.7 |  |  |  |  |  |  |  |  |  |  |
Debt instrument , Purchase Price |  |  |  | 38.9 |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  |  | 0.5 |  |  |  |  |  |  |  |  |  |  |
Senior notes carrying value |  |  |  | $ 37.5 |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum amount | $ 1,250.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, amount borrowed |  |  |  |  |  |  |  |  |  |  | 200.0 |  |  |  |
Interest expense |  |  |  |  |  |  | 14.0 | 16.5 |  | $ 40.9 | 53.9 |  |  |  |
Amortization of deferred financing costs |  |  |  |  |  |  | $ 0.6 | $ 0.5 |  | $ 1.7 | $ 1.9 |  |  |  |
2018 Credit Facility [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base rate interest rate floor |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
2018 Credit Facility [Member] | Federal Funds Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  |  |  |  |  | 0.50% |  |  |  |  |
2018 Credit Facility [Member] | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum amount | $ 250.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.35% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Fourth Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum amount | $ 330.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Adjusted term SOFR interest periods of one month |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate | 0.11% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount | $ 250.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Fourth Amendment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility, maximum amount | 286.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal amount | $ 750.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Base Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  |  |  |  |  | 1.50% |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | 2018 Revolving Credit Facility [Member] | Adjusted term SOFR interest periods of three month |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate | 0.26% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | 2018 Revolving Credit Facility [Member] | Adjusted term Sofr interest periods of six month |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate | 0.43% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | 2018 Revolving Credit Facility [Member] | Adjusted term SOFR interest periods of twelve month |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate spread on variable rate | 0.72% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Convertible debt underwriters over allotment option. + References No definition available. + Details
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- Definition Rate by which if during the five business-day period immediately after any five consecutive trading day period, or the measurement period, the trading price per $1,000 principal amount of Convertible Notes for each trading day of that measurement period was less than the product of the last reported sale price of our common shares and the conversion rate for the Convertible Notes for each such day. + References No definition available. + Details
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- Definition Senior notes carrying value. + References No definition available. + Details
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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1F -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 835 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482925/835-30-45-3 + Details
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