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Cloud Computing Costs
 3 Months Ended
Mar. 31, 2024
Research and Development [Abstract]  
Cloud Computing Costs Cloud Computing Costs
Capitalized costs to implement cloud computing arrangements at cost and accumulated amortization were as follows: 
(in millions)March 31, 2024December 31, 2023
Short-term portion$27.1 $26.4 
Long-term portion122.3 116.9 
Total capitalized implementation costs149.4 143.3 
Less: accumulated amortization(42.7)(36.6)
Capitalized implementation costs, net$106.7 $106.7 
Amortization expense was $6.1 million and $4.3 million for the three months ended March 31, 2024 and 2023, respectively.