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Temporary Equity, Equity and Dividends (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 20, 2023
Mar. 07, 2023
Feb. 01, 2023
Jan. 22, 2023
Jan. 03, 2023
Aug. 02, 2023
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dividends Payable [Line Items]                      
Common stock, unlimited shares authorized                 Unlimited   Unlimited
Issuance of common stock                 $ 15.0    
Dividend paid                 13.4    
Gain (Loss) from intra-entity foreign currency transactions             $ (0.7) $ (8.6) $ 0.6 $ (9.4)  
Special Dividend [Member]                      
Dividends Payable [Line Items]                      
Dividends declared (USD per share)   $ 1.08             $ 1.08    
Preferential Dividends                      
Dividends Payable [Line Items]                      
Preferred Stock, dividends             6.7   $ 10.9    
Dividend paid                 9.8    
Dividends accrued and unpaid             1.1   1.1    
Participating Dividends                      
Dividends Payable [Line Items]                      
Preferred Stock, dividends             1.8   3.6    
Securities Purchase Agreement [Member]                      
Dividends Payable [Line Items]                      
Initial conversion price     $ 73.00                
Starboard Value LP and certain of its affiliates | Securities Purchase Agreement [Member]                      
Dividends Payable [Line Items]                      
Issuance of common stock     $ 15.0                
Shares issued for business combination [Member]                      
Dividends Payable [Line Items]                      
Share capital from additional paid-in capital             0.3 1.8 0.3 1.8  
Unrecognized share based continuing employment costs             $ 1.7 $ 6.5 $ 1.7 $ 6.5  
Unrecognized share based continuing employment costs, weighted average period for recognition                 9 months 18 days    
VeriTread                      
Dividends Payable [Line Items]                      
Non-controlling interest, percentage         4.00%            
Series A Senior Preferred Shares [Member]                      
Dividends Payable [Line Items]                      
Temporary equity, authorized shares             485,000,000   485,000,000    
Issuance of redeemable convertible preferred stock                 $ 482.0    
Series A Senior Preferred Shares [Member] | Starboard Value LP and certain of its affiliates | Securities Purchase Agreement [Member]                      
Dividends Payable [Line Items]                      
Issuance of redeemable convertible preferred stock     $ 485.0                
Initial preferred dividend, percentage     5.50%                
Participating dividends     $ 0.27                
Increase in preferred dividend rate in fourth anniversary, percentage     7.50%                
Spread on variable rate, percentage     6.00%                
Increase in preferred dividend rate in ninth anniversary, percentage     10.50%                
Notice term for redemption of preferred shares     45 days                
Redemption price, percentage     100.00%                
Subsequent Event                      
Dividends Payable [Line Items]                      
Dividends declared (USD per share)           $ 0.27          
Dividends payable date           Sep. 13, 2023          
Dividends, date of record           Aug. 23, 2023          
IAA, Inc [Member]                      
Dividends Payable [Line Items]                      
Cash consideration $ 1,714.2     $ 1,700.0              
VeriTread                      
Dividends Payable [Line Items]                      
Prior holdings of issued and outstanding shares, percent         11.00%            
Voting equity interests owned including previous interest, percentage         75.00%            
Cash consideration         $ 28.1            
Remaining units ownership interest, percentage         21.00%