LEASES - Topic 842 Adjustments (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current assets	$ 1,604.6	$ 1,523.3	$ 1,524.6
Net property, plant and equipment	817.3	723.4	728.5
Other assets	2,435.9	1,271.2	1,128.9
TOTAL ASSETS	4,857.8	3,517.9	3,382.0
Accrued expenses	270.6	262.3	262.7
Current portion of operating lease liabilities	38.0	32.0	0.0
All other current liabilities		553.0	553.0
Long-term liabilities	2,681.4	1,512.9	1,408.7
Retained earnings	2,701.8	2,613.9	2,613.8
Other equity		(1,456.2)	(1,456.2)
TOTAL LIABILITIES AND EQUITY	$ 4,857.8	3,517.9	$ 3,382.0
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current assets		(1.3)
Net property, plant and equipment		(5.1)
Other assets		142.3
TOTAL ASSETS		135.9
Accrued expenses		(0.4)
Current portion of operating lease liabilities		32.0
All other current liabilities		0.0
Long-term liabilities		104.2
Retained earnings		0.1
Other equity		0.0
TOTAL LIABILITIES AND EQUITY		$ 135.9