Components of Net Periodic Benefit Cost from Continuing Operations (Detail) - Pension Plans, Defined Benefit - U.S. Pension Plans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 4.5	$ 4.9
Interest cost	5.2	4.7
Expected return on plan assets	(3.9)	(5.6)
Amortization prior service cost	0.1	0.1
Amortization of actuarial loss	0.6	0.8
Net Periodic Benefit Cost	$ 6.5	$ 4.9