Other Non-Operating Interest (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Nonoperating Income (Expense) [Abstract]
FX gain/(loss)	$ (5.9)	$ (9.6)
Pension Expense	2.3	1.7
Joint venture income	1.3	1.0
Other	3.3	(0.8)
Total	$ 1.0	$ (7.7)