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Segment Information (Schedule of Segment Information) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting [Line Items]        
Total revenue $ 1,092.7 $ 981.8 $ 3,387.3 $ 3,142.6
Selling, general and administrative 217.8 177.8 645.0 584.5
Acquisition-related and integration costs 4.0 6.0 9.8 22.9
Depreciation and amortization 124.7 111.9 355.9 329.9
Interest expense 48.2 57.2 145.6 181.0
Income tax expense 16.5 26.2 81.9 95.3
Net income 95.2 76.0 318.2 294.4
Service revenue        
Segment Reporting [Line Items]        
Total revenue 845.0 779.9 2,584.7 2,488.1
Direct expenses 353.0 339.7 1,068.8 1,041.5
Inventory sales revenue        
Segment Reporting [Line Items]        
Total revenue 247.7 201.9 802.6 654.5
Direct expenses 236.1 193.5 757.5 612.8
Reportable Segment        
Segment Reporting [Line Items]        
Total revenue 1,092.7 981.8 3,387.3 3,142.6
Selling, general and administrative 217.8 177.8 645.0 584.5
Acquisition-related and integration costs 4.0 6.0 9.8 22.9
Depreciation and amortization 124.7 111.9 355.9 329.9
Interest expense 48.2 57.2 145.6 181.0
Income tax expense 16.5 26.2 81.9 95.3
Other segment items (2.8) (6.5) 4.6 (19.7)
Net income 95.2 76.0 318.2 294.4
Reportable Segment | Service revenue        
Segment Reporting [Line Items]        
Direct expenses 353.0 339.7 1,068.8 1,041.5
Reportable Segment | Inventory sales revenue        
Segment Reporting [Line Items]        
Direct expenses $ 236.1 $ 193.5 $ 757.5 $ 612.8