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Other Assets - Other Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Other Assets    
Investments $ 584.2 $ 469.4
Operating right-of-use lease assets 228.9 238.1
Deferred compensation plan 119.6 112.7
Derivative and hedging assets 87.9 74.1
Reinsurance receivable 91.8 92.1
Deferred contract costs and sales commissions 82.1 82.5
Prepaid fees and capitalized implementation costs for cloud-based hosting arrangements 79.9 67.6
Amounts recoverable for capping, closure and post-closure obligations 22.5 21.9
Deferred financing costs 3.3 3.6
Other 19.2 21.9
Total $ 1,319.4 $ 1,183.9