DISCONTINUED OPERATIONS AND ASSETS AND LIABILITIES HELD FOR SALE - Construction (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Coventry
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition		$ (1.2)
Germany Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on post-closing adjustment		$ 5.8
Indian
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition	$ (1.6)