New Accounting Pronouncements - Narrative (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Item Effected [Line Items]
Total net sales	$ 1,679.5	$ 1,620.0	$ 3,387.3	$ 3,278.9
Total gross profit	290.6	302.0	585.3	628.8
Inventories	(324.4)	(401.7)	(324.4)	(401.7)	$ (416.8)
Accrued liabilities	(378.7)		(378.7)		(447.5)
Stockholders equity	(261.8)		(261.8)		$ (217.6)
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Item Effected [Line Items]
Total net sales	0.7		5.9
Total gross profit	0.3		0.9
Inventories	68.7		68.7
Accrued liabilities	80.9		80.9
Stockholders equity	$ 13.6		13.6
Accounting Standards Update 2018 02
Item Effected [Line Items]
Expect to decrease accumulated deficit and increase accumulated other comprehensive loss			$ 22.0
Cost of Sales | Accounting Standards Update 2017 07
Item Effected [Line Items]
Operating change by adoption of new accounting standard		(1.1)		(2.1)
Selling, General and Administrative Expenses | Accounting Standards Update 2017 07
Item Effected [Line Items]
Operating change by adoption of new accounting standard		(3.1)		(6.2)
Investment And Other Income Net | Accounting Standards Update 2017 07
Item Effected [Line Items]
Operating change by adoption of new accounting standard		$ 4.2		$ 8.3