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Cloud Computing Costs
 6 Months Ended
Jun. 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)June 30, 2024December 31, 2023
Short-term portion$28.2 $26.4 
Long-term portion126.1 116.9 
Total capitalized implementation costs154.3 143.3 
Less: accumulated amortization(48.2)(36.6)
Capitalized implementation costs, net$106.1 $106.7 
Amortization expense was $6.5 million and $5.0 million for the three months ended June 30, 2024 and 2023, respectively, and was $12.6 million and $9.3 million for the six months ended June 30, 2024 and 2023, respectively.