Debt (Narrative) (Details) $ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023 CAD ($)	Mar. 20, 2023 USD ($)	Mar. 15, 2023 USD ($)
Revolving Credit Facility
Debt [Line Items]
Weighted average interest rate	7.40%	5.40%
2023 Secured Notes | Secured Debt
Debt [Line Items]
Aggregate principal amount						$ 550.0
Interest rate	6.75%					6.75%
2023 Unsecured Notes | Unsecured Debt
Debt [Line Items]
Aggregate principal amount						$ 800.0
Interest rate	7.75%					7.75%
Revolving Credit Facility | Revolving credit facilities, Maturing September 2026
Debt [Line Items]
Maximum borrowing capacity	$ 712.8
Revolving Credit Facility | Revolving credit facilities, No Maturity
Debt [Line Items]
Available borrowing capacity	$ 5.0
USD TLA Facility | Term Loans
Debt [Line Items]
Weighted average interest rate	7.94%
Aggregate principal amount					$ 1,800.0
Quarterly instalments as percentage of principal amount outstanding (as percentage)			1.25%
Repayments of debt	$ 150.0
Delayed Draw Term Loan CAD | Term Loans
Debt [Line Items]
Aggregate principal amount				$ 115.9