Purchase Price Allocation of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Jul. 31, 2015	Dec. 31, 2014
Preliminary value assigned:
Goodwill	$ 3,531.8		$ 2,880.2
Waddington
Preliminary value assigned:
Accounts receivable		$ 83.5
Inventories		141.2
Other current assets		19.8
Property, plant and equipment		139.6
Intangible assets		615.0
Goodwill		668.1
Other assets		2.4
Accounts payable		(36.6)
Other current liabilities		(78.1)
Long-term debt		(627.3)
Non-current deferred tax liability		(234.7)
Total purchase price, net of cash acquired		$ 692.9