FAIR VALUE MEASUREMENTS - Other instruments (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Other Financial Instruments
Liabilities representing checks issued but not yet presented for payment	$ 26.9	$ 19.3
Accrued interest	29.8
Accrued payroll related general and administrative expenses		43.5
Accrued operating expenses	54.5	53.9
Allowance for Trade Receivables [Member]
Other Financial Instruments
Aggregate allowance for doubtful accounts	$ 1.8	$ 1.6