SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS AND ALLOWANCES (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]
Deferred tax valuation allowance increase	$ 52.1
Valuation allowance of deferred tax assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	889.8	$ 128.3	$ 22.3
Additions, charged expense, net	0.0	761.5	106.0
Additions, adjustments	0.0	0.0	0.0
Deductions	(19.9)	0.0	0.0
Balance at end of period	869.9	889.8	128.3
Luxembourg [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Deferred tax valuation allowance increase	19.8	747.0
U.S. [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Deferred tax valuation allowance increase	$ (41.7)	$ 12.0	43.0
Tax years 2014 and prior [Member] | U.S. [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Deferred tax valuation allowance increase			$ 62.0