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Contractual interest rate for funds borrowed, under the debt agreement.

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Weighted average interest rate of debt outstanding.

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Debt (Narrative) (Details) - USD ($) $ in Millions				3 Months Ended
Debt (Narrative) (Details) - USD ($) $ in Millions	Mar. 20, 2023	Jan. 22, 2023	May 04, 2022	Mar. 31, 2023	Jun. 30, 2022	Mar. 15, 2023	Dec. 31, 2022	Dec. 21, 2021	Dec. 21, 2016
Debt [Line Items]
Deferred debt issue costs, non-current				$ 5.1			$ 3.9
Issuance cost capitalized				20.3
Acquisition-related costs incurred				0.6
Loss on redemption of 2016 Notes				3.3
Term Loans
Debt [Line Items]
Maximum borrowing capacity	$ 2,700.0
Unamortized deferred debt issue costs				20.5			$ 0.4
Deferred debt issue costs, non-current				1.4
Debt issuance costs				$ 22.3
Senior Notes [Member] \| IAA
Debt [Line Items]
Redemption price percentage		102.75%
Revolving Credit Facility
Debt [Line Items]
Weighted average interest rate				6.50%			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%
Unamortized deferred debt issue costs				$ 7.7
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%
Unamortized deferred debt issue costs				$ 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						$ 19.0
Revolving Credit Facility \| Revolving credit facilities, Maturing September 2026 [Member]
Debt [Line Items]
Maximum borrowing capacity				709.4
Revolving Credit Facility \| Revolving credit facilities, Maturing October 2023 [Member]
Debt [Line Items]
Available borrowing capacity				5.0
Revolving Credit Facility \| Revolving credit facilities, No Maturity [Member]
Debt [Line Items]
Available borrowing capacity				$ 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				7.69%
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				7.54%
Aggregate principal amount	$ 1,800.0
Quarterly instalments as percentage of principal amount outstanding (as percentage)	1.25%
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%