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Other Assets - Other Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Other Assets    
Operating right-of-use lease assets $ 238.0 $ 243.6
Deferred compensation plan 101.2 118.0
Investments 94.2 87.8
Reinsurance receivable 88.8 78.9
Deferred contract costs and sales commissions 80.6 83.1
Other derivative assets 61.6 2.9
Amounts recoverable for capping, closure and post-closure obligations 32.0 31.8
Prepaid fees and capitalized implementation costs for cloud-based hosting arrangements 30.0 32.0
Interest rate swaps 21.0 10.7
Deferred financing costs 2.7 3.0
Other 47.7 55.8
Total $ 797.8 $ 747.6