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 |