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Revenue and Segment Information - Segment Information Of Revenues, Gross Profit And Operating Income (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Revenue from external customers | $ 5,517.9 | $ 5,878.3 | $ 5,543.1
Segment gross profit | 2,046.2 | 2,305.5 | 2,080.2
PSG |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from external customers | 2,788.3 | 3,038.2 | 2,819.3
Segment gross profit | 976.0 | 1,110.1 | 959.8
ASG |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from external customers | 1,972.3 | 2,071.2 | 1,950.9
Segment gross profit | 794.8 | 878.3 | 817.8
ISG |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from external customers | 757.3 | 768.9 | 772.9
Segment gross profit | $ 275.4 | $ 317.1 | $ 302.6

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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