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REVENUE (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Revenue $ 4,431.2 $ 4,285.6 $ 3,879.4
current and long-term contract assets and current and long-term deferred revenue      
Deferred revenue - current 160.9 170.5  
Deferred revenue - noncurrent 41.3 36.5  
Other contract liabilities - current 39.8 29.8  
2021 21.8    
2022 12.8    
Thereafter 6.7    
Transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 3,348.4 3,205.9  
Transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 1,082.8 1,079.7  
Americas      
Disaggregation of Revenue [Line Items]      
Revenue 2,229.1 2,145.7  
Americas | Transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 1,592.4 1,530.6  
Americas | Transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 636.7 615.1  
Asia Pacific      
Disaggregation of Revenue [Line Items]      
Revenue 1,278.0 1,244.2  
Asia Pacific | Transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 1,007.1 973.5  
Asia Pacific | Transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 270.9 270.7  
Europe, Middle East, & Africa      
Disaggregation of Revenue [Line Items]      
Revenue 924.1 895.7  
Europe, Middle East, & Africa | Transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Revenue 748.9 701.8  
Europe, Middle East, & Africa | Transferred over time      
Disaggregation of Revenue [Line Items]      
Revenue 175.2 193.9  
Critical infrastructure & solutions      
Disaggregation of Revenue [Line Items]      
Revenue 2,632.6 2,451.8 2,136.5
Critical infrastructure & solutions | Americas      
Disaggregation of Revenue [Line Items]      
Revenue 1,355.4 1,246.4  
Critical infrastructure & solutions | Asia Pacific      
Disaggregation of Revenue [Line Items]      
Revenue 763.2 723.9  
Critical infrastructure & solutions | Europe, Middle East, & Africa      
Disaggregation of Revenue [Line Items]      
Revenue 514.0 481.5  
Services & software solutions      
Disaggregation of Revenue [Line Items]      
Revenue 1,298.9 1,276.1  
Services & software solutions | Americas      
Disaggregation of Revenue [Line Items]      
Revenue 679.4 669.8  
Services & software solutions | Asia Pacific      
Disaggregation of Revenue [Line Items]      
Revenue 336.0 339.1  
Services & software solutions | Europe, Middle East, & Africa      
Disaggregation of Revenue [Line Items]      
Revenue 283.5 267.2  
I.T. & Edge infrastructure      
Disaggregation of Revenue [Line Items]      
Revenue 499.7 557.7 $ 527.0
I.T. & Edge infrastructure | Americas      
Disaggregation of Revenue [Line Items]      
Revenue 194.3 229.5  
I.T. & Edge infrastructure | Asia Pacific      
Disaggregation of Revenue [Line Items]      
Revenue 178.8 181.2  
I.T. & Edge infrastructure | Europe, Middle East, & Africa      
Disaggregation of Revenue [Line Items]      
Revenue $ 126.6 $ 147.0