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Other Assets - Other Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Other Assets    
Investments $ 371.6 $ 281.4
Operating right-of-use lease assets 238.0 275.1
Deferred compensation plan 104.8 100.6
Derivative and hedging assets 110.3 105.8
Reinsurance receivable 86.7 84.1
Deferred contract costs and sales commissions 82.2 80.2
Prepaid fees and capitalized implementation costs for cloud-based hosting arrangements 58.8 51.4
Amounts recoverable for capping, closure and post-closure obligations 22.1 20.5
Deferred financing costs 4.0 5.1
Other 23.3 21.3
Total $ 1,101.8 $ 1,025.5