Revenue Recognition - Effect of Adopting of ASU 606 (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017	Dec. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total inventories – net	$ 678.8	$ 659.7	$ 638.8
Deferred income tax assets		52.6
Other accrued liabilities		411.4
Retained earnings	3,886.7	3,770.5	3,772.3
Balance at December 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total inventories – net			638.8
Deferred income tax assets			52.0
Other accrued liabilities			388.1
Retained earnings			$ 3,772.3
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings	$ (2.4)
Accounting Standards Update 2014-09 | Topic 606 Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total inventories – net		20.9
Deferred income tax assets		0.6
Other accrued liabilities		23.3
Retained earnings		$ (1.8)