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Employee Retirement Plans
 9 Months Ended
Sep. 30, 2024
Retirement Benefits [Abstract]  
Employee Retirement Plans Employee Retirement Plans
Amounts related to our employee retirement plans are as follows:
 Three Months Ended September 30,Nine Months Ended
September 30,
 2024202320242023
 (in millions)
Defined contribution expense$3.1 $2.5 $9.0 $7.5