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Employee Retirement Plans
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Employee Retirement Plans Employee Retirement Plans
Amounts related to our employee retirement plans are as follows:
 Three Months Ended June 30,Six Months Ended
June 30,
 2024202320242023
 (in millions)
Defined contribution expense$2.9 $2.6 $5.9 $5.0