Supplemental Balance Sheet Data - Schedule of Depreciation Expense (Details) - USD ($) $ in Millions	3 Months Ended		4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Jun. 02, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 5.5	$ 5.7	$ 7.4	$ 9.6	$ 16.9
Cost of sales
Property, Plant and Equipment [Line Items]
Depreciation expense	5.1	5.3	6.9	8.9	15.9
Depreciation and amortization expense
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 0.4	$ 0.4	$ 0.5	$ 0.7	$ 1.0