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Cloud Computing Costs
9 Months Ended
Sep. 30, 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)September 30, 2024December 31, 2023
Short-term portion$29.7 $26.4 
Long-term portion129.7 116.9 
Total capitalized implementation costs159.4 143.3 
Less: accumulated amortization(55.1)(36.6)
Capitalized implementation costs, net$104.3 $106.7 
Amortization expense was $6.9 million and $5.4 million for the three months ended September 30, 2024 and 2023, respectively, and was $19.5 million and $14.7 million for the nine months ended September 30, 2024 and 2023, respectively.