Divestitures and Held for Sale - Schedule of Major Classes of Assets and Liabilities Held for Sale (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Accounts receivable, net	$ 124.2	$ 206.9
Inventories	109.2	236.7
Prepaid expenses and other	12.9	37.7
Property, plant and equipment, net	94.0	288.0
Operating lease assets, net	13.3	0.0
Goodwill	38.7	219.7
Other intangible assets, net	565.0	1,263.0
Other assets	9.4	12.9
Current assets held for sale	966.7	2,264.9
Accounts payable	64.6	146.0
Accrued compensation	29.3	49.1
Other accrued liabilities	67.6	80.3
Deferred income taxes	129.8	251.7
Operating lease liabilities	8.6	0.0
Other liabilities	8.8	15.1
Current liabilities held for sale	$ 308.7	$ 542.2