Pension and Other Postretirement Benefit Plans - Components of Net Periodic Benefit Costs (Credit) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. Pension
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost		$ 5.6	$ 4.7	$ 3.7
Interest cost		29.8	28.7	28.5
Expected return on plan assets		(38.1)	(39.4)	(38.1)
Amortization of actuarial (gain) loss		2.7	2.6	(0.3)
Curtailment loss		0.0	0.0	0.0
Settlement loss	$ 34.2	34.4	0.2	0.1
Net periodic benefit cost (credit)		34.4	(3.2)	(6.1)
Foreign Pension
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost		6.5	8.4	8.8
Interest cost		15.8	16.2	20.4
Expected return on plan assets		(23.2)	(25.7)	(27.0)
Amortization of actuarial (gain) loss		3.1	4.1	1.3
Curtailment loss		0.0	7.7	0.0
Settlement loss		0.4	0.0	0.0
Net periodic benefit cost (credit)		2.6	10.7	3.5
U.S. Other Postretirement
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost		0.2	0.2	0.2
Interest cost		3.2	3.1	4.0
Amortization of actuarial (gain) loss		(1.3)	(1.2)	(0.7)
Amortization of prior service credit		0.0	0.0	0.0
Special termination benefits		0.0	0.0	0.0
Net periodic benefit cost (credit)		2.1	2.1	3.5
Foreign Other Postretirement
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Service cost		0.5	0.7	0.9
Interest cost		1.6	1.7	2.0
Amortization of actuarial (gain) loss		0.2	0.5	0.1
Amortization of prior service credit		(0.3)	(0.4)	(0.4)
Special termination benefits		0.3	0.8	0.8
Net periodic benefit cost (credit)		$ 2.3	$ 3.3	$ 3.4