Postretirement Benefit Plans - Changes in Projected Benefit Obligations of Pension and Other Employee-Related Defined Benefit Plans (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020	Dec. 31, 2019
Change in benefit obligation
Benefit obligation – January 1		$ 242.8		$ 525.4
Service cost		2.1		2.3
Interest cost		2.8		10.7
Actuarial (gain) loss(a)	[1]	(14.6)		52.3
Benefits paid		(10.3)		(28.4)
Settlement		(0.2)		(328.5)
Foreign currency translation		(8.3)		9.0
Benefit obligation – December 31		214.3		242.8	$ 525.4
Pension Plan [Member]
Change in benefit obligation
Benefit obligation – January 1		124.5
Service cost		1.4		1.5	1.4
Interest cost		1.0		7.9	12.6
Benefit obligation – December 31		107.9		124.5
Other Postretirement Benefits Plan [Member]
Change in benefit obligation
Benefit obligation – January 1		118.3		116.6
Service cost		0.7		0.8	0.7
Interest cost		1.8		2.8	4.0
Actuarial (gain) loss(a)		(8.2)	[1]	4.0
Benefits paid		(6.2)		(5.9)
Settlement		0.0		0.0
Foreign currency translation		0.0		0.0
Benefit obligation – December 31		106.4		118.3	116.6
United States | Pension Plan [Member]
Change in benefit obligation
Benefit obligation – January 1		15.5		310.4
Service cost		0.0		0.0	0.2
Interest cost		0.3		6.9	11.1
Actuarial (gain) loss(a)	[1]	(0.1)		45.0
Benefits paid		(0.9)		(18.9)
Settlement		0.0		(327.9)
Foreign currency translation		0.0		0.0
Benefit obligation – December 31		14.8		15.5	310.4
International Plan [Member] | Pension Plan [Member]
Change in benefit obligation
Benefit obligation – January 1		109.0		98.4
Service cost		1.4		1.5	1.2
Interest cost		0.7		1.0	1.5
Actuarial (gain) loss(a)		(6.3)	[1]	3.3
Benefits paid		(3.2)		(3.6)
Settlement		(0.2)		(0.6)
Foreign currency translation		(8.3)		9.0
Benefit obligation – December 31		$ 93.1		$ 109.0	$ 98.4

[1] In 2021, the actuarial gain is primarily due to an increase in discount rates. In 2020, the actuarial loss is primarily due to a decrease in discount rates in addition to the annuity premium in connection with the U.S. qualified pension plan termination.