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Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Segment Reporting [Abstract]      
Revenues $ 5,350.0 $ 5,521.9  
Operating Income (Loss) 263.0 346.4  
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax 5,350.0 5,521.9  
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Operating Income (Loss) 263.0 346.4  
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 15,539.0   $ 15,060.9
Other Nonoperating Income (Expense) (21.6) (10.1)  
EES      
Segment Reporting [Abstract]      
Adjusted EBITDA $ 165.8 $ 183.0  
Adjusted EBITDA Margin % 7.90% 8.60%  
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,099.0 $ 2,135.1  
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 4,620.5   4,553.6
Depreciation, Depletion and Amortization 11.2 9.9  
Other Nonoperating Income (Expense) 5.7 0.5  
CSS      
Segment Reporting [Abstract]      
Adjusted EBITDA $ 127.2 $ 155.5  
Adjusted EBITDA Margin % 7.60% 9.00%  
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,670.1 $ 1,732.0  
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 5,502.9   5,626.6
Depreciation, Depletion and Amortization 18.0 18.0  
Other Nonoperating Income (Expense) 18.8 0.8  
UBS      
Segment Reporting [Abstract]      
Adjusted EBITDA $ 169.4 $ 187.7  
Adjusted EBITDA Margin % 10.70% 11.30%  
Segment Reporting, Revenue Reconciling Item [Line Items]      
Revenue from Contract with Customer, Excluding Assessed Tax $ 1,580.9 $ 1,654.8  
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 3,992.7   3,908.5
Depreciation, Depletion and Amortization 7.0 6.0  
Other Nonoperating Income (Expense) 0.8 $ 0.6  
Corporate Segment      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 1,422.9   $ 972.2