REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue, Major Customer [Line Items]
Total operating revenues	$ 1,442.8	$ 1,530.4	$ 2,861.0	$ 3,159.8
Bermuda
Revenue, Major Customer [Line Items]
Total operating revenues			0.0	0.0
Americas
Revenue, Major Customer [Line Items]
Total operating revenues	1,108.1	1,183.3	2,191.5	2,428.1
Asia-Pacific (APAC)
Revenue, Major Customer [Line Items]
Total operating revenues	63.7	70.3	133.6	155.5
Europe, Middle East and Africa (EMEA)
Revenue, Major Customer [Line Items]
Total operating revenues	$ 271.0	$ 276.8	$ 535.9	$ 576.2