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LEASES - Credit Quality Indicator (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]    
2021 $ 147.2  
2020 128.1  
2019 44.6  
2018 17.0  
2017 6.1  
Prior 1.4  
Net Investment 344.4 $ 275.0
High    
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]    
2021 76.0  
2020 56.0  
2019 25.8  
2018 5.5  
2017 3.6  
Prior 0.9  
Net Investment 167.8  
Moderate    
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]    
2021 70.5  
2020 67.4  
2019 18.6  
2018 11.5  
2017 2.5  
Prior 0.5  
Net Investment 171.0  
Low    
Sales-type Lease, Net Investment in Lease, Credit Quality Indicator [Line Items]    
2021 0.7  
2020 4.7  
2019 0.2  
2018 0.0  
2017 0.0  
Prior 0.0  
Net Investment $ 5.6