EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss)
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Balance at beginning of period	$ 251.5	$ 234.2	$ 250.1	$ 235.1
Other comprehensive loss before reclassifications	(0.4)	19.3	(2.0)	19.4
Impact of initial adoption of ASC 606			(0.3)
Stranded income tax effects resulting from tax reform			4.8
Amounts reclassified from accumulated other comprehensive income (loss)	(0.6)	(0.2)	(2.1)	(1.2)
Current-period other comprehensive loss	(1.0)	19.1	0.4	18.2
Balance at end of period	250.5	253.3	250.5	253.3
Foreign Currency Translation Adjustment
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Balance at beginning of period	229.4	229.3	230.2	229.7
Other comprehensive loss before reclassifications	0.0	2.4	(0.8)	2.0
Impact of initial adoption of ASC 606
Stranded income tax effects resulting from tax reform			0.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	0.0	0.0
Current-period other comprehensive loss	0.0	2.4	(0.8)	2.0
Balance at end of period	229.4	231.7	229.4	231.7
Net Unrealized Gains (Losses) on Qualifying Cash Flow Hedges
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Balance at beginning of period	(0.2)	1.3	0.8	1.5
Other comprehensive loss before reclassifications	(0.4)	0.6	(1.2)	1.1
Impact of initial adoption of ASC 606			(0.3)
Stranded income tax effects resulting from tax reform			0.2
Amounts reclassified from accumulated other comprehensive income (loss)	0.3	(0.1)	0.2	(0.8)
Current-period other comprehensive loss	(0.1)	0.5	(1.1)	0.3
Balance at end of period	(0.3)	1.8	(0.3)	1.8
Tax benefit (provision)	0.1	(1.1)	0.1	(1.1)	$ 0.1	$ (0.5)	$ (0.8)		$ (0.9)
Pension and Postretirement Liability Adjustment
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Balance at beginning of period	22.3	3.6	19.1	3.9
Other comprehensive loss before reclassifications	0.0	16.3	0.0	16.3
Impact of initial adoption of ASC 606			0.0
Stranded income tax effects resulting from tax reform			4.6
Amounts reclassified from accumulated other comprehensive income (loss)	(0.9)	(0.1)	(2.3)	(0.4)
Current-period other comprehensive loss	(0.9)	16.2	2.3	15.9
Balance at end of period	21.4	19.8	21.4	19.8
Tax benefit (provision)	$ (7.2)	(12.9)	$ (7.2)	$ (12.9)	$ (7.3)	$ (12.5)		$ (2.6)	$ (2.7)
Postretirement Plans
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Increase (decrease) for plan amendment		$ 26.8