Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 1,098.4	$ 897.3
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	837.1	639.9
Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	261.3	257.4
Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	627.9	461.5
Critical infrastructure & solutions | Restatement Adjustment
Disaggregation of Revenue [Line Items]
Net sales		(37.9)
Services & spares
Disaggregation of Revenue [Line Items]
Net sales	321.8	306.3
Services & spares | Restatement Adjustment
Disaggregation of Revenue [Line Items]
Net sales		3.7
Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	148.7	129.5
Integrated rack solutions | Restatement Adjustment
Disaggregation of Revenue [Line Items]
Net sales		34.2
Americas
Disaggregation of Revenue [Line Items]
Net sales	501.5	466.7
Americas | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	360.5	313.2
Americas | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	141.0	153.5
Americas | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	279.2	239.8
Americas | Services & spares
Disaggregation of Revenue [Line Items]
Net sales	154.2	161.6
Americas | Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	68.1	65.3
Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	357.4	223.9
Asia Pacific | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	281.6	160.9
Asia Pacific | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	75.8	63.0
Asia Pacific | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	216.3	116.3
Asia Pacific | Services & spares
Disaggregation of Revenue [Line Items]
Net sales	95.5	79.3
Asia Pacific | Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	45.6	28.3
Europe, Middle East, & Africa
Disaggregation of Revenue [Line Items]
Net sales	239.5	206.7
Europe, Middle East, & Africa | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	195.0	165.8
Europe, Middle East, & Africa | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	44.5	40.9
Europe, Middle East, & Africa | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	132.4	105.4
Europe, Middle East, & Africa | Services & spares
Disaggregation of Revenue [Line Items]
Net sales	72.1	65.4
Europe, Middle East, & Africa | Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	$ 35.0	$ 35.9