Segment Information - Schedule of Sales by Products and Services Offering (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from External Customer [Line Items]
Net sales	$ 1,162.0	$ 1,070.7	$ 3,064.9	$ 3,259.7
Critical infrastructure & solutions
Revenue from External Customer [Line Items]
Net sales	662.3	574.9	1,678.1	1,820.4
Critical infrastructure & solutions | Restatement Adjustment
Revenue from External Customer [Line Items]
Net sales		(52.6)		(118.4)
Services & spares
Revenue from External Customer [Line Items]
Net sales	341.9	342.5	964.9	985.4
Services & spares | Restatement Adjustment
Revenue from External Customer [Line Items]
Net sales		17.3		28.1
Integrated rack solutions
Revenue from External Customer [Line Items]
Net sales	$ 157.8	153.3	$ 421.9	453.9
Integrated rack solutions | Restatement Adjustment
Revenue from External Customer [Line Items]
Net sales		$ 35.3		$ 90.3