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WARRANTIES - Changes in Product Warranty Reserve (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at beginning of year $ 267.7 $ 153.7
Acquisitions 4.3 127.8
Warranty expense 130.0 105.5
Warranty claim payments (131.3) (118.0)
Foreign currency impact 7.8 (1.3)
Balance at end of year $ 278.5 $ 267.7