REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Net sales	$ 1,399.4	$ 1,260.3	$ 2,555.8	$ 2,358.7
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	1,028.6	967.2	1,868.1	1,804.3
Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	370.8	293.1	687.7	554.4
Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	846.7	726.8	1,511.6	1,354.7
Services & spares
Disaggregation of Revenue [Line Items]
Net sales	369.2	363.2	703.4	684.9
Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	183.5	170.3	340.8	319.1
Americas
Disaggregation of Revenue [Line Items]
Net sales	647.2	564.9	1,182.3	1,066.4
Americas | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	452.4	403.1	830.5	763.6
Americas | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	194.8	161.8	351.8	302.8
Americas | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	368.9	305.3	663.2	584.8
Americas | Services & spares
Disaggregation of Revenue [Line Items]
Net sales	187.6	179.6	352.3	333.7
Americas | Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	90.7	80.0	166.8	147.9
Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	407.2	398.0	740.0	755.4
Asia Pacific | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	328.5	315.8	584.9	597.4
Asia Pacific | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	78.7	82.2	155.1	158.0
Asia Pacific | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	243.0	239.8	426.8	455.8
Asia Pacific | Services & spares
Disaggregation of Revenue [Line Items]
Net sales	112.9	106.3	217.5	201.8
Asia Pacific | Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	51.3	51.9	95.7	97.8
Europe, Middle East, & Africa
Disaggregation of Revenue [Line Items]
Net sales	345.0	297.4	633.5	536.9
Europe, Middle East, & Africa | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	247.7	248.3	452.7	443.3
Europe, Middle East, & Africa | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	97.3	49.1	180.8	93.6
Europe, Middle East, & Africa | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	234.8	181.7	421.6	314.1
Europe, Middle East, & Africa | Services & spares
Disaggregation of Revenue [Line Items]
Net sales	68.7	77.3	133.6	149.4
Europe, Middle East, & Africa | Integrated rack solutions
Disaggregation of Revenue [Line Items]
Net sales	$ 41.5	$ 38.4	$ 78.3	$ 73.4