LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Lease liabilites
2020 (excluding the three months ended March 31, 2020)	$ 27.5
2021	39.5
2022	38.6
2023	36.7
2024	35.3
Thereafter	234.6
Total undiscounted lease liabilities	412.2
Less: Amount representing interest	(107.3)
Total present value of minimum lease payments	304.9
Amounts recognized in the December 31, 2019 consolidated balance sheet:
Current operating lease liabilities	22.3	$ 22.6
Long-term operating lease liabilities	282.6	$ 291.7
Total present value of minimum lease payments	$ 304.9