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Debt (Narrative) (Details) $ in Millions, $ in Millions			12 Months Ended
Debt (Narrative) (Details) $ in Millions, $ in Millions	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