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GOODWILL AND OTHER INTANGIBLE ASSETS - Schedule of Changes in the Carrying Amount of Goodwill, by Segment (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Goodwill    
Beginning balance   $ 626.1
Goodwill acquired during the year   458.6
Currency translation adjustment $ (14.3) 41.8
Ending balance 1,112.2 1,126.5
United States    
Goodwill    
Beginning balance   567.2
Goodwill acquired during the year   142.1
Currency translation adjustment 0.0 0.0
Ending balance 709.3 709.3
Europe    
Goodwill    
Beginning balance   58.9
Goodwill acquired during the year   0.0
Currency translation adjustment (3.0) 8.3
Ending balance 64.2 67.2
Rest of World    
Goodwill    
Beginning balance   0.0
Goodwill acquired during the year   316.5
Currency translation adjustment (11.3) 33.5
Ending balance $ 338.7 $ 350.0