Basis of Presentation - Trade Receivable, Net (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 174.7	$ 176.4
Allowance for credit losses	(2.0)	(1.3)
Trade receivables, net	172.7	175.1
Trade receivables — billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	131.5	136.6
Trade receivables — unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade receivables	$ 43.2	$ 39.8