Summary Adoption of New Accounting Standard Impact on Balance Sheet (Detail) - USD ($) $ in Millions		Dec. 31, 2018	Jan. 01, 2018		Dec. 31, 2017		Dec. 31, 2016
Assets
Inventories, net		$ 757.9			$ 704.3		$ 609.0
Other current assets		1.9			2.8
Equity
Retained Earnings		2,041.8			4,079.2
ASU 2014-09
Assets
Inventories, net		757.9	$ 841.8	[1]	859.1	[1]
Other current assets		244.6	250.9	[1]	228.9	[1]
Equity
Retained Earnings		2,041.8	4,082.5	[1]	$ 4,079.2	[1]
ASU 2014-09 | Balances without adoption of ASC 606
Assets
Inventories, net		773.6
Other current assets		225.1
Equity
Retained Earnings		2,039.1
ASU 2014-09 | Effect of Changes
Assets
Inventories, net		(15.7)
Other current assets		19.5
Equity
Retained Earnings		$ 2.7
ASU 2014-09 | Adjustments due to ASU 2014-09
Assets
Inventories, net	[1]		(17.3)
Other current assets	[1]		22.0
Equity
Retained Earnings	[1]		$ 3.3

[1] Impact at adoption which included both continuing and discontinued operations.