EQUITY AND LONG-TERM INCENTIVE COMPENSATION - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Jun. 27, 2020	Dec. 31, 2019	Jun. 29, 2019	Dec. 31, 2018
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Balance at beginning of period	$ 552.1	$ 436.7	$ 502.4	$ 414.9
Other comprehensive income before reclassifications	2.1	(2.4)	(6.9)	(3.3)
Amounts reclassified from accumulated other comprehensive income (loss)	(0.2)	(0.4)	(0.2)	(1.7)
Current-period other comprehensive income (loss)	1.9	(2.8)	(7.1)	(5.0)
Balance at end of period	583.1	461.3	583.1	461.3
Accum. Other Comprehensive Income
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Balance at beginning of period	235.3	242.7	244.3	244.9
Balance at end of period	237.2	239.9	237.2	239.9
Foreign Currency Translation Adjustment
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Balance at beginning of period	227.2	227.2	228.0	225.8
Other comprehensive income before reclassifications	1.7	(1.8)	0.9	(0.4)
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	0.0	0.0
Current-period other comprehensive income (loss)	1.7	(1.8)	0.9	(0.4)
Balance at end of period	228.9	225.4	228.9	225.4
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	(8.0)	(2.7)	(1.6)	(0.6)
Other comprehensive income before reclassifications	0.4	(0.6)	(7.8)	(2.9)
Amounts reclassified from accumulated other comprehensive income (loss)	0.7	0.4	2.5	0.6
Current-period other comprehensive income (loss)	1.1	(0.2)	(5.3)	(2.3)
Balance at end of period	(6.9)	(2.9)	(6.9)	(2.9)
Tax benefit (provision)	2.2	1.0	2.2	1.0	$ 2.6	$ 0.5	$ 0.9	$ 0.2
Pension and Postretirement Liability Adjustment
Components of accumulated other comprehensive income, net of tax [Roll Forward]
Balance at beginning of period	16.1	18.2	17.9	19.7
Other comprehensive income before reclassifications	0.0	0.0	0.0	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	(0.9)	(0.8)	(2.7)	(2.3)
Current-period other comprehensive income (loss)	(0.9)	(0.8)	(2.7)	(2.3)
Balance at end of period	15.2	17.4	15.2	17.4
Tax benefit (provision)	$ (5.2)	$ (5.9)	$ (5.2)	$ (5.9)	$ (5.5)	$ (6.1)	$ (6.1)	$ (6.6)