Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 1,260.3	$ 1,005.7	$ 2,358.7	$ 1,903.0
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	967.2	742.6	1,804.3	1,382.5
Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	293.1	263.1	554.4	520.5
Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	726.8	547.3	1,354.7	1,006.7
Critical infrastructure & solutions | Restatement Adjustment
Disaggregation of Revenue [Line Items]
Net sales	4.9		7.0
Services & spares
Disaggregation of Revenue [Line Items]
Net sales	363.2	311.9	684.9	617.5
Services & spares | Restatement Adjustment
Disaggregation of Revenue [Line Items]
Net sales	(8.7)		(11.4)
Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	170.3	146.5	319.1	278.8
Integrated rack solutions | Restatement Adjustment
Disaggregation of Revenue [Line Items]
Net sales	3.8		4.4
Americas
Disaggregation of Revenue [Line Items]
Net sales	564.9	484.7	1,066.4	951.4
Americas | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	403.1	332.4	763.6	645.6
Americas | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	161.8	152.3	302.8	305.8
Americas | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	305.3	251.1	584.8	491.2
Americas | Services & spares
Disaggregation of Revenue [Line Items]
Net sales	179.6	161.1	333.7	322.7
Americas | Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	80.0	72.5	147.9	137.5
Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	398.0	322.8	755.4	546.7
Asia Pacific | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	315.8	256.8	597.4	417.7
Asia Pacific | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	82.2	66.0	158.0	129.0
Asia Pacific | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	239.8	196.8	455.8	310.8
Asia Pacific | Services & spares
Disaggregation of Revenue [Line Items]
Net sales	106.3	86.1	201.8	164.9
Asia Pacific | Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	51.9	39.9	97.8	71.0
Europe, Middle East, & Africa
Disaggregation of Revenue [Line Items]
Net sales	297.4	198.2	536.9	404.9
Europe, Middle East, & Africa | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	248.3	153.4	443.3	319.2
Europe, Middle East, & Africa | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	49.1	44.8	93.6	85.7
Europe, Middle East, & Africa | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	181.7	99.4	314.1	204.7
Europe, Middle East, & Africa | Services & spares
Disaggregation of Revenue [Line Items]
Net sales	77.3	64.7	149.4	129.9
Europe, Middle East, & Africa | Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	$ 38.4	$ 34.1	$ 73.4	$ 70.3