SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - PRODUCT WARRANTY COSTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Abstract]
Balance at beginning of period	$ 99.8	$ 75.4	$ 67.0
Provision for warranty expense	63.6	66.1	41.9
Settlements of warranty claims	(52.9)	(41.7)	(33.5)
Balance at end of period	$ 110.5	$ 99.8	$ 75.4