Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 897.3	$ 1,054.8
Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	639.9	812.3
Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	257.4	242.5
Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	499.4	638.8
Services & software solutions
Disaggregation of Revenue [Line Items]
Net sales	302.6	306.0
I.T. & Edge infrastructure
Disaggregation of Revenue [Line Items]
Net sales	95.3	110.0
Americas
Disaggregation of Revenue [Line Items]
Net sales	466.7	554.4
Americas | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	313.2	415.9
Americas | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	153.5	138.5
Americas | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	264.1	359.4
Americas | Services & software solutions
Disaggregation of Revenue [Line Items]
Net sales	159.8	152.2
Americas | I.T. & Edge infrastructure
Disaggregation of Revenue [Line Items]
Net sales	42.8	42.8
Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	223.9	259.0
Asia Pacific | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	160.9	196.7
Asia Pacific | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	63.0	62.3
Asia Pacific | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	123.1	138.4
Asia Pacific | Services & software solutions
Disaggregation of Revenue [Line Items]
Net sales	76.9	85.2
Asia Pacific | I.T. & Edge infrastructure
Disaggregation of Revenue [Line Items]
Net sales	23.9	35.4
Europe, Middle East, & Africa
Disaggregation of Revenue [Line Items]
Net sales	206.7	241.4
Europe, Middle East, & Africa | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net sales	165.8	199.7
Europe, Middle East, & Africa | Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	40.9	41.7
Europe, Middle East, & Africa | Critical infrastructure & solutions
Disaggregation of Revenue [Line Items]
Net sales	112.2	141.0
Europe, Middle East, & Africa | Services & software solutions
Disaggregation of Revenue [Line Items]
Net sales	65.9	68.6
Europe, Middle East, & Africa | I.T. & Edge infrastructure
Disaggregation of Revenue [Line Items]
Net sales	$ 28.6	$ 31.8