Revision of Prior Period Financial Statements - Revisions to the Condensed Consolidated Statements of Cash Flows (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net earnings	$ 22.2	$ (173.8)	$ 171.1	$ 172.9	$ (2.7)	$ 19.5	$ 565.5
(Gain) loss on divestiture of assets	$ (12.3)				3.4	(8.9)
Changes in operating assets and liabilities, net of effect of acquisitions:
Income taxes			(12.6)		21.9	29.9	(140.2)
Inventories			(57.9)		(140.8)	(196.5)	(132.7)
Accounts payable and accrued expenses			(151.4)		92.0	(251.5)	(2.9)
Other assets and liabilities			24.8		(85.5)	$ (23.7)	103.0
As Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net earnings		(158.2)	176.8	165.3	18.6		562.5
(Gain) loss on divestiture of assets					(18.9)
Changes in operating assets and liabilities, net of effect of acquisitions:
Income taxes			(13.3)		30.5		(134.3)
Inventories			(62.2)		(149.9)		(134.2)
Accounts payable and accrued expenses			(149.5)		95.8		6.5
Other assets and liabilities			22.2		(87.8)		92.2
Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net earnings		$ (15.6)	(5.7)	$ 7.6	(21.3)		3.0
(Gain) loss on divestiture of assets					22.3
Changes in operating assets and liabilities, net of effect of acquisitions:
Income taxes			0.7		(8.6)		(5.9)
Inventories			4.3		9.1		1.5
Accounts payable and accrued expenses			(1.9)		(3.8)		(9.4)
Other assets and liabilities			$ 2.6		$ 2.3		$ 10.8