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Segment Information (Schedule of Segment Information) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting [Line Items]    
Total revenue $ 1,108.6 $ 1,064.7
Selling, general and administrative 205.0 198.1
Acquisition-related and integration costs 3.1 12.8
Depreciation and amortization 114.5 107.7
Interest expense 49.9 63.9
Income tax expense 29.6 32.5
Net income 113.3 107.4
Service revenue    
Segment Reporting [Line Items]    
Total revenue 852.5 849.1
Direct expenses 361.9 353.0
Inventory sales revenue    
Segment Reporting [Line Items]    
Total revenue 256.1 215.6
Direct expenses 235.0 196.6
Reportable Segment    
Segment Reporting [Line Items]    
Total revenue 1,108.6 1,064.7
Selling, general and administrative 205.0 198.1
Acquisition-related and integration costs 3.1 12.8
Depreciation and amortization 114.5 107.7
Interest expense 49.9 63.9
Income tax expense 29.6 32.5
Other segment items (3.7) (7.3)
Net income 113.3 107.4
Reportable Segment | Service revenue    
Segment Reporting [Line Items]    
Direct expenses 361.9 353.0
Reportable Segment | Inventory sales revenue    
Segment Reporting [Line Items]    
Direct expenses $ 235.0 $ 196.6