OTHER COMPREHENSIVE LOSS - Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	$ 2,869.1	$ 2,828.6
Other comprehensive income before reclassifications	(128.1)	(217.4)
Amounts reclassified from accumulated other comprehensive income	2.1	5.8
Net current period other comprehensive income	(126.0)	(211.6)
Balance end of period	9,993.6	2,869.1
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(202.2)	5.1
Other comprehensive income before reclassifications	(106.4)	(207.3)
Amounts reclassified from accumulated other comprehensive income	0.0	0.0
Net current period other comprehensive income	(106.4)	(207.3)
Balance end of period	(308.6)	(202.2)
Derivative contracts
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(0.1)	4.0
Other comprehensive income before reclassifications	(3.2)	(7.8)
Amounts reclassified from accumulated other comprehensive income	0.0	3.7
Net current period other comprehensive income	(3.2)	(4.1)
Balance end of period	(3.3)	(0.1)
Pension and Post Retirement Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(54.3)	(54.1)
Other comprehensive income before reclassifications	(18.5)	(2.3)
Amounts reclassified from accumulated other comprehensive income	2.1	2.1
Net current period other comprehensive income	(16.4)	(0.2)
Balance end of period	(70.7)	(54.3)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance beginning of period	(256.6)	(45.0)
Balance end of period	$ (382.6)	$ (256.6)