ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance			$ (871.5)
Other comprehensive income other than reclassifications	$ 30.8	$ (3.5)	(13.7)	$ (110.4)
Reclassifications into earnings:
Derivative losses on cash flow hedges, net of tax				0.6
Amortization of net actuarial loss and prior service cost, net of tax	1.3	2.0	2.5	4.0
Total reclassifications into earnings	1.3	2.0	2.5
Accumulated other comprehensive income, ending balance	(1,003.1)		(1,003.1)
Derivative losses on cash flow hedges, tax				0.0
Amortization of net actuarial loss and prior service cost, tax	0.2	0.2	0.4	0.4
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance	(1,082.7)	(1,049.6)	(1,038.2)	(942.7)
Other comprehensive income other than reclassifications	30.8	(3.5)	(13.7)	(110.4)
Reclassifications into earnings:
Total reclassifications into earnings	0.0	0.0	0.0	0.0
Accumulated other comprehensive income, ending balance	(1,051.9)	(1,053.1)	(1,051.9)	(1,053.1)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance				(0.6)
Reclassifications into earnings:
Derivative losses on cash flow hedges, net of tax				0.6
Total reclassifications into earnings				0.6
Accumulated other comprehensive income, ending balance		0.0		0.0
Net Investment Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance	(4.3)	(4.3)	(4.3)	(4.3)
Other comprehensive income other than reclassifications	0.0	0.0	0.0
Reclassifications into earnings:
Total reclassifications into earnings	0.0	0.0	0.0	0.0
Accumulated other comprehensive income, ending balance	(4.3)	(4.3)	(4.3)	(4.3)
Pension and Postretirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance	(90.1)	(90.4)	(91.3)	(92.4)
Other comprehensive income other than reclassifications	0.0	0.0	0.0
Reclassifications into earnings:
Amortization of net actuarial loss and prior service cost, net of tax	1.3	2.0	2.5	4.0
Total reclassifications into earnings	1.3	2.0	2.5	4.0
Accumulated other comprehensive income, ending balance	(88.8)	(88.4)	(88.8)	(88.4)
AOCI Attributable to Parent
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance	(1,177.1)	(1,144.3)	(1,133.8)	(1,040.0)
Reclassifications into earnings:
Total reclassifications into earnings				4.6
Accumulated other comprehensive income, ending balance	$ (1,145.0)	$ (1,145.8)	$ (1,145.0)	$ (1,145.8)