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Debt (Narrative) (Details) - USD ($) $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2023 | Jan. 22, 2023 | May 04, 2022 | Jun. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2023 | Mar. 15, 2023 | Dec. 31, 2022 | Dec. 21, 2021 | Dec. 21, 2016
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt principal repaid |  |  |  |  |  | $ 602.2 | $ 1,093.8 |  |  |  |  |
Current portion |  |  |  | $ 18.6 |  | 18.6 |  |  |  | $ 4.4 |  |
Deferred debt issue costs, non-current |  |  |  | 4.7 |  | 4.7 |  |  |  | 3.9 |  |
Issuance cost capitalized |  |  |  |  |  |  |  | $ 20.5 |  |  |  |
Debt issuance costs, current |  |  |  | 1.0 |  | 1.0 |  |  |  |  |  |
Acquisition-related costs incurred |  |  |  |  |  |  |  | 0.6 |  |  |  |
Loss on redemption of 2016 Notes |  |  |  |  |  | 3.3 | $ 4.8 |  |  |  |  |
Term Loans |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 2,700.0 |  |  |  |  |  |  |  |  |  |  |
Unamortized deferred debt issue costs |  |  |  | $ 18.1 |  | $ 18.1 |  |  |  | $ 0.4 |  |
Deferred debt issue costs, non-current |  |  |  |  |  |  |  | 1.4 |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  | $ 22.5 |  |  |  |
Senior Notes [Member] | IAA |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 102.75% |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  | 5.90% |  | 5.90% |  |  |  | 5.80% |  |
5.375% Senior Unsecured Note, Due January 2025 [Member] | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 500.0
Interest rate |  |  |  |  |  |  |  |  |  | 5.375% |  | 5.375%
Redemption price percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |
Unamortized deferred debt issue costs |  |  |  |  |  |  |  |  |  | $ 3.6 |  |
Maturity date |  |  |  |  |  | Jan. 15, 2025 |  |  |  |  |  |
Loss on redemption of 2016 Notes | $ 3.3 |  |  |  |  |  |  |  |  |  |  |
4.75% Senior Unsecured Note, Due January 2031 (2021 USD Notes) | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 600.0 |
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.75% |
4.95% Senior Unsecured Note, Due December 2029 (2021 CAD Notes) | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 425.0 |
Interest rate |  |  |  |  |  |  |  |  |  |  | 4.95% |
6.75% Senior Secured Note, Due March 2028 [Member] | Senior Secured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 550.0 |  |  |
Interest rate |  |  |  | 6.75% |  | 6.75% |  |  | 6.75% |  |  |
Unamortized deferred debt issue costs |  |  |  | $ 7.6 |  | $ 7.6 |  |  |  |  |  |
7.75% Senior Unsecured Note, Due March 2031 [Member] | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 800.0 |  |  |
Interest rate |  |  |  | 7.75% |  | 7.75% |  |  | 7.75% |  |  |
Unamortized deferred debt issue costs |  |  |  | $ 11.2 |  | $ 11.2 |  |  |  |  |  |
2021 Notes | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  | 100.00% |  |  |  |  |  |  |  |  |
Loss on redemption of 2016 Notes |  |  | $ 4.8 |  |  |  |  |  |  |  |  |
2023 Notes | Senior Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Deferred debt issue costs, non-current |  |  |  |  |  |  |  |  | $ 19.6 |  |  |
Revolving Credit Facility | Revolving credit facilities, Maturing September 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 715.9 |  | 715.9 |  |  |  |  |  |
Revolving Credit Facility | Revolving credit facilities, Maturing October 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  |  | 5.0 |  | 5.0 |  |  |  |  |  |
Revolving Credit Facility | Revolving credit facilities, No Maturity [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  |  | $ 5.0 |  | $ 5.0 |  |  |  |  |  |
Bridge Loan Facility | Term Loans |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | 2.8 |  |  |  |  |  |  |  |  |  |  |
Backstop Revolving Facility | Term Loans |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | 750.0 |  |  |  |  |  |  |  |  |  |  |
Commitments | 88.9 |  |  |  |  |  |  |  |  |  |  |
Delayed Draw Term Loan, In Canadian Dollars, Available until September 2026 [Member] | Term Loans |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  |  |  | 5.86% |  |
Annual amortization rate |  |  |  |  | 5.00% |  |  |  |  |  |  |
Aggregate principal amount | $ 115.9 |  |  |  |  |  |  |  |  |  |  |
Term Loan A Facility Loan 7.69% Maturing in September 2026 [Member] | Term Loans |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  | 7.58% |  |  |  |
Annual amortization rate | 5.00% |  |  |  |  |  |  |  |  |  |  |
Term Loan A Facility Loan 7.54% Maturing in September 2026 [Member] | Term Loans |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,900.0 |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  |  | 7.67% |  | 7.67% |  |  |  |  |  |
Aggregate principal amount | $ 1,800.0 |  |  | $ 1,800.0 |  | $ 1,800.0 |  |  |  |  |  |
Quarterly instalments as percentage of principal amount outstanding (as percentage) |  |  |  | 1.25% |  | 1.25% |  |  |  |  |  |
Debt principal repaid |  |  |  | $ 100.0 |  |  |  |  |  |  |  |
Mandatory principal repayment repaid |  |  |  | 22.8 |  |  |  |  |  |  |  |
Voluntary repayment repaid, fully applied to the mandatory repayment amounts due on September 30, 2023, December 31, 2023, and March 31, 2024, and partially applied to the June 30, 2024 mandatory repayment |  |  |  | 77.2 |  |  |  |  |  |  |  |
Current portion |  |  |  | $ 14.1 |  | $ 14.1 |  |  |  |  |  |
Term Loan A Facility Loan 7.54% Maturing in September 2026 [Member] | Term Loans | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate (as percentage) | 7.54% |  |  |  |  |  |  |  |  |  |  |

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