EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Jun. 29, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Other comprehensive loss before reclassifications	$ (2.4)	$ (0.4)	$ (3.3)	$ (2.0)
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)	(0.4)	(0.6)	(1.7)	(2.1)
Current-period other comprehensive loss	(2.8)	(1.0)	(5.0)	0.4
Accum. Other Comprehensive Income
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Balance at beginning of period	242.7	251.5	244.9	250.1
Balance at end of period	239.9	250.5	239.9	250.5
Foreign Currency Translation Adjustment
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Balance at beginning of period	227.2	229.4	225.8	230.2
Other comprehensive loss before reclassifications	(1.8)	0.0	(0.4)	(0.8)
Impact of initial adoption of ASC 606				0.0
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	(1.8)	0.0	(0.4)	(0.8)
Balance at end of period	225.4	229.4	225.4	229.4
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	(2.7)	(0.2)	(0.6)
Other comprehensive loss before reclassifications	(0.6)	(0.4)	(2.9)
Amounts reclassified from accumulated other comprehensive income (loss)	0.4	0.3	0.6
Current-period other comprehensive loss	(0.2)	(0.1)	(2.3)
Balance at end of period	(2.9)	(0.3)	(2.9)	(0.3)
Tax benefit (provision)	1.0		1.0		$ 0.9
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				0.8
Other comprehensive loss before reclassifications				(1.2)
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)				0.2
Current-period other comprehensive loss				(1.1)
Balance at end of period		(0.3)		(0.3)
Tax benefit (provision)		0.1		0.1		$ 0.2	$ 0.1	$ (0.5)
Pension and Postretirement Liability Adjustment
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Balance at beginning of period	18.2	22.3	19.7	19.1
Other comprehensive loss before reclassifications	0.0	0.0	0.0	0.0
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)	(0.8)	(0.9)	(2.3)	(2.3)
Current-period other comprehensive loss	(0.8)	(0.9)	(2.3)	2.3
Balance at end of period	17.4	21.4	17.4	21.4
Tax benefit (provision)	$ (5.9)	$ (7.2)	$ (5.9)	$ (7.2)	$ (6.1)	$ (6.6)	$ (7.3)	$ (12.5)