SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Dec. 31, 2018 |
|
New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |||||
Retained earnings | $ 1,819.0 | $ 1,819.0 | $ 1,521.7 | ||
Price allocated to remaining performance obligations | 1,415.9 | 1,415.9 | |||
Revenue recognized | 91.5 | $ 82.0 | 223.7 | $ 197.8 | |
Costs capitalized as contract acquisition costs | $ 39.8 | $ 39.8 | $ 34.2 |