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Revenue and Segment Information - Segment Information Of Revenues, Gross Profit And Operating Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue from external customers	$ 5,255.0	$ 5,517.9	$ 5,878.3
Segment gross profit	1,769.9	2,046.2	2,305.5
PSG
Segment Reporting Information [Line Items]
Revenue from external customers	2,606.1	2,788.3	3,038.2
Segment gross profit	801.7	976.0	1,110.1
ASG
Segment Reporting Information [Line Items]
Revenue from external customers	1,910.4	1,972.3	2,071.2
Segment gross profit	730.5	794.8	878.3
ISG
Segment Reporting Information [Line Items]
Revenue from external customers	738.5	757.3	768.9
Segment gross profit	$ 237.7	$ 275.4	$ 317.1

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