PREPAID AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Unbilled receivables	$ 149.8	$ 107.9
Prepaid operating ground leases	150.9	148.6
Prepaid income tax	72.4	136.5
Value added tax and other consumption tax receivables	83.2	64.2
Prepaid assets	47.9	39.6
Other miscellaneous current assets	60.2	71.8
Prepaid and other current assets	$ 564.4	$ 568.6