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Lease Obligations (Lease Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating lease costs:      
Lease costs $ 65.6 $ 65.4 $ 56.1
Variable lease costs 15.0 18.6 15.1
Total operating lease costs 80.6 84.0 71.2
Short-term lease costs 6.6 6.6 6.6
Finance lease costs:      
Amortization of right-of-use assets 1.5 1.8 1.7
Interest on lease liabilities 0.1 0.1 0.1
Total finance lease costs 1.6 1.9 1.8
Total lease costs $ 88.8 $ 92.5 $ 79.6