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Leases (Tables)
9 Months Ended
Sep. 30, 2023
Leases [Abstract]  
Components of Lease Expenses The components of operating lease expense were as follows:
Three Months EndedNine Months Ended
 September 30, 2023September 30, 2022September 30, 2023September 30, 2022
Operating lease costs$8.9 $11.9 $28.3 $34.3 
Variable lease costs3.6 3.8 11.2 8.8 
Sublease income(3.6)(2.5)(8.1)(6.2)
Total net lease cost$8.9 $13.2 $31.4 $36.9