LEASES - Maturities of Lease Liabilities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Leases
April 2019 through December 2019	$ 29.6
2020	33.6
2021	30.0
2022	23.2
2023	19.0
Thereafter	60.6
Total undiscounted cash flows	196.0
Total lease liability	114.9
Short-term lease liability	16.9
Long-term lease liability	98.0
Difference between undiscounted cash flows and discounted cash flows	81.1
Finance Leases
April 2019 through December 2019	0.6
2020	0.4
2021	0.2
2022	0.1
2023	0.0
Thereafter	0.0
Total undiscounted cash flows	1.3
Total lease liability	1.2
Short-term lease liability	0.7
Long-term lease liability	0.5
Difference between undiscounted cash flows and discounted cash flows	$ 0.1