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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Retained earnings $ 2,142.6   $ 2,142.6   $ 1,521.7
Price allocated to remaining performance obligations 1,419.4   1,419.4    
Revenue recognized 57.7 $ 47.0 281.4 $ 244.8  
Costs capitalized as contract acquisition costs $ 43.4   $ 43.4   $ 34.2