INCOME TAXES - Expirations of tax loss carry forwards (Details) $ in Millions	Jun. 30, 2017 USD ($)
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	$ 1,327.6
Tax Year 2018
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	48.6
Tax Year 2019
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	14.7
Tax Year 2020
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	74.9
Tax Year 2021
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	12.8
Tax Year 2022 and Thereafter
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	1,176.6
United States
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	813.5
United States | Tax Year 2018
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	0.0
United States | Tax Year 2019
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	0.0
United States | Tax Year 2020
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	0.0
United States | Tax Year 2021
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	0.0
United States | Tax Year 2022 and Thereafter
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	813.5
Western Europe
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	240.6
Western Europe | Tax Year 2018
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	0.0
Western Europe | Tax Year 2019
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	0.0
Western Europe | Tax Year 2020
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	0.0
Western Europe | Tax Year 2021
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	0.8
Western Europe | Tax Year 2022 and Thereafter
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	239.8
Rest of World
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	273.5
Rest of World | Tax Year 2018
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	48.6
Rest of World | Tax Year 2019
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	14.7
Rest of World | Tax Year 2020
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	74.9
Rest of World | Tax Year 2021
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	12.0
Rest of World | Tax Year 2022 and Thereafter
Tax Credit Carryforward [Line Items]
Operating loss carryforwards	$ 123.3