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Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax $ 5,489.4 $ 5,644.4 $ 16,319.1 $ 16,911.8  
Depreciation, Depletion and Amortization 46.0 45.1 137.6 136.4  
Other Nonoperating Income (Expense) 24.9 (3.7) 99.3 (14.6)  
Assets 15,275.0   15,275.0   $ 15,060.9
EES          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 2,151.2 2,190.7 6,423.1 6,526.1  
Adjusted EBITDA $ 186.3 $ 191.5 $ 547.0 $ 563.5  
Adjusted EBITDA Margin % 8.70% 8.70% 8.50% 8.60%  
Depreciation, Depletion and Amortization $ 12.2 $ 10.9 $ 34.8 $ 32.3  
Other Nonoperating Income (Expense) 5.6 1.7 14.3 12.0  
Assets 4,648.2   4,648.2   4,553.6
CSS          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 1,955.1 1,778.0 5,491.1 5,360.9  
Adjusted EBITDA $ 175.2 $ 175.5 $ 453.2 $ 510.5  
Adjusted EBITDA Margin % 9.00% 9.90% 8.30% 9.50%  
Depreciation, Depletion and Amortization $ 17.6 $ 18.0 $ 53.9 $ 53.9  
Other Nonoperating Income (Expense) 4.7 9.7 39.4 38.2  
Assets 5,830.7   5,830.7   5,626.6
UBS          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenue from Contract with Customer, Excluding Assessed Tax 1,383.1 1,675.7 4,404.9 5,024.8  
Adjusted EBITDA $ 156.5 $ 196.4 $ 499.4 $ 572.7  
Adjusted EBITDA Margin % 11.30% 11.70% 11.30% 11.40%  
Depreciation, Depletion and Amortization $ 6.9 $ 6.3 $ 21.3 $ 18.7  
Other Nonoperating Income (Expense) (19.7) 0.6 (122.1) (0.5)  
Assets 3,671.1   3,671.1   3,908.5
Corporate Segment          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Depreciation, Depletion and Amortization 9.3 9.9 27.6 31.5  
Other Nonoperating Income (Expense) (15.5) $ 8.3 (30.9) $ (35.1)  
Assets $ 1,125.0   $ 1,125.0   $ 972.2