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Receivables, net (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Receivables, Net, Current [Abstract]    
Accounts Receivable, before Allowance for Credit Loss, Current $ 148.8 $ 139.0
Accounts Receivable, Allowance for Credit Loss, Current (1.5) (1.6)
Unbilled Receivables, Current 7.7 5.1
Income Taxes Receivable, Current 2.9 16.0
Other Receivables, Net, Current 1.6 2.1
Receivables, Net $ 159.4 $ 160.6