Restructuring - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Person	Dec. 31, 2014 USD ($) Person	Dec. 31, 2013 USD ($) Person
Restructuring Cost and Reserve [Line Items]
Number of employees | Person	3,000	1,150	1,100
Restructuring costs | $	$ 117.8	$ 88.3	$ 103.2
Valves And Controls [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees | Person	2,500	600	500
Restructuring costs | $	$ 76.5	$ 48.8	$ 51.0
Flow & Filtration Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees | Person	200	350	250
Restructuring costs | $	$ 11.2	$ 14.0	$ 17.8
Water Quality Systems [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees | Person	100	50	50
Restructuring costs | $	$ 6.2	$ 15.2	$ 5.0
Technical Solutions [Member]
Restructuring Cost and Reserve [Line Items]
Number of employees | Person	200	150	300
Restructuring costs | $	$ 15.7	$ 4.3	$ 19.4