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Debt (Narrative) (Details) $ in Millions, $ in Millions |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 20, 2023 USD ($) | May 04, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Mar. 15, 2023 USD ($) | Dec. 21, 2021 USD ($) | Dec. 21, 2021 CAD ($) | Dec. 21, 2016 USD ($)
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current portion |  |  | $ 14.2 | $ 4.4 |  |  |  |  |  |  |
Deferred debt issue costs |  |  | 4.0 | 3.9 |  |  |  |  |  |  |
Issuance cost capitalized |  |  |  |  |  |  | $ 20.6 |  |  |  |
Acquisition-related costs incurred |  |  |  |  |  |  | 0.6 |  |  |  |
Loss on redemption of Notes |  |  | 3.3 | 4.8 | $ 0.0 |  |  |  |  |  |
Term loans |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 2,700.0 |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  | 22.6 |  |  |  |
Deferred debt issue costs |  |  |  |  |  |  | $ 1.4 |  |  |  |
Unamortized deferred debt issue costs |  |  | $ 15.0 | $ 0.4 |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  | 5.40% | 5.80% |  |  |  |  |  |  |
5.375% Senior unsecured notes due in January 2025 (the "2016 Notes") | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 500.0
Unamortized deferred debt issue costs |  |  | $ 0.0 | $ 3.6 |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  | 5.375%
Redemption price percentage | 100.00% |  |  |  |  |  |  |  |  |  |
Loss on redemption of Notes | $ 3.3 |  |  |  |  |  |  |  |  |  |
2021 Notes | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 100.00% |  |  |  |  |  |  |  |  |
Loss on redemption of Notes |  | $ 4.8 |  |  |  |  |  |  |  |  |
2021 USD Notes | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 600.0 |  |
Interest rate |  |  |  |  |  |  |  |  | 4.75% | 4.75% |
2021 CAD Notes | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 425.0 |
Interest rate |  |  |  |  |  |  |  |  | 4.95% | 4.95% |
2023 Notes |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  | 19.7 |  |  |  |  |  |  |  |
2023 Secured Notes | Secured Debt |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 550.0 |  |  |
Unamortized deferred debt issue costs |  |  | 6.8 | 0.0 |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 6.75% |  |  |
2023 Unsecured Notes | Unsecured Debt |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 800.0 |  |  |
Unamortized deferred debt issue costs |  |  | 10.5 | 0.0 |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 7.75% |  |  |
Revolving Credit Facility | Revolving credit facilities, Maturing September 2026 |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  | 724.7 |  |  |  |  |  |  |  |
Revolving Credit Facility | Revolving credit facilities, No Maturity |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  | $ 5.0 |  |  |  |  |  |  |  |
DDTL Facility loan denominated in Canadian dollars, secured | Term loans |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  | 5.86% |  |  |  |  |  |  |  |
Aggregate principal amount | 115.9 |  |  |  |  |  |  |  |  |  |
Bridge Loan Facility | Term loans |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | 2,800.0 |  |  |  |  |  |  |  |  |  |
Backstop Revolving Facility | Term loans |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | 750.0 |  |  |  |  |  |  |  |  |  |
Commitments |  |  |  | 88.9 |  |  |  |  |  |  |
USD TLA Facility | Term loans |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  | 7.95% |  |  |  |  |  |  |  |
Aggregate principal amount | $ 1,800.0 |  |  | 1,800.0 |  | $ 1,800.0 |  |  |  |  |
Quarterly instalments as percentage of principal amount outstanding (as percentage) |  |  |  |  |  | 1.25% |  |  |  |  |
Maximum borrowing capacity |  |  | $ 1,900.0 |  |  |  |  |  |  |  |
USD TLA Facility | Term loans | SOFR |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable interest rate (as percentage) | 7.54% |  |  |  |  |  |  |  |  |  |
CAD TLA Facility | Term loans |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate |  |  | 7.90% |  |  |  |  |  |  |  |
Annual amortization rate | 5.00% |  |  |  |  |  |  |  |  |  |
Term Loan A Facility |  |  |  |  |  |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unamortized deferred debt issue costs |  |  | $ 4.0 | $ 4.3 |  |  |  |  |  |  |

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