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Operating Expenses
 6 Months Ended
Jun. 30, 2024
Operating Expenses [Abstract]  
Operating Expenses
6. Operating Expenses
Acquisition-Related and Integration Costs

Acquisition-related and integration costs consist of operating expenses incurred in connection with business combinations, such as due diligence, advisory, legal, integration, severance, acceleration of share-based payments expense, and share-based continuing employment costs. Integration costs primarily include expenses incurred with third-parties to support integration activities to achieve cost synergies and integration goals relating to recent acquisitions.
The following table summarizes acquisition-related and integration costs by significant acquisition and nature:
Three months ended
June 30,		Six months ended
June 30,
2024202320242023
IAA acquisition
Financing$— $— $— $30.0 
Severance2.5 8.7 7.7 22.7 
Integration1.6 12.0 7.0 17.1 
Acceleration of share-based payments expense— 0.9 0.9 5.9 
Legal— 2.6 — 12.1 
Investment banking, consulting and other acquisition-related costs— 2.7 1.1 64.3 
Settlement of pre-existing contractual arrangement— 16.3 — 16.3 
4.1 43.2 16.7 168.4 
Other acquisitions— 3.1 0.2 4.1 
Total acquisition-related and integration costs$4.1 $46.3 $16.9 $172.5 
Depreciation and Amortization
Three months ended
June 30,		Six months ended
June 30,
2024202320242023
Depreciation$25.3 $25.5 $50.2 $37.0 
Amortization85.0 84.1 167.8 108.8 
$110.3 $109.6 $218.0 $145.8