ACQUISITIONS - Purchase Price Allocation (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 3,604.0	$ 3,591.0	$ 3,758.2
Adjustments to Prior Year Acquisitions
Business Acquisition [Line Items]
Fixed assets	(6.0)
Intangibles	7.9
Goodwill	(7.4)
Net other assets and liabilities	(1.5)
Net deferred tax liabilities	(3.4)
Total purchase price allocation	(10.4)
Acquisitions Year 2017
Business Acquisition [Line Items]
Fixed assets	3.9
Intangibles	28.2
Goodwill	46.5
Net other assets and liabilities	1.1
Net deferred tax liabilities	(0.3)
Total purchase price allocation	$ 79.4
Acquisitions Year 2016
Business Acquisition [Line Items]
Fixed assets		13.1
Intangibles		35.5
Goodwill		52.8
Net other assets and liabilities		2.2
Net deferred tax liabilities		(2.2)
Total purchase price allocation		$ 101.4
Acquisitions Year 2015
Business Acquisition [Line Items]
Fixed assets			196.2
Intangibles			1,016.8
Goodwill			1,450.9
Net other assets and liabilities			59.5
Net deferred tax liabilities			(225.3)
Total purchase price allocation			$ 2,498.1