Postretirement Benefit Plans - Other Changes in Plan Assets and Net Periodic Postretirement Cost Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Net periodic postretirement cost
Service cost		$ 2.1		$ 2.3
Interest cost		2.8		10.7
Pension settlement charges		0.0		137.0		$ 0.0
Pension Plan [Member]
Net periodic postretirement cost
Service cost		1.4		1.5		1.4
Interest cost		1.0		7.9		12.6
Expected return on plan assets		0.0		(7.2)		(14.8)
Amortization of net actuarial loss		1.8		6.3		5.1
Amortization of prior service cost		0.0		0.0		0.7
Net periodic postretirement cost		4.2		8.5		5.0
Pension settlement charges		(3.4)	[1]	137.0	[1]	0.0
Total net periodic postretirement cost		0.8		145.5		5.0
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Net actuarial (gain) loss		(6.4)		37.9		0.1
Amortization of net actuarial loss		(1.8)		(143.3)		(5.1)
Amortization of prior service cost		0.0		0.0		(0.7)
Foreign currency translation		(2.7)		2.9		(0.3)
Total change recognized in other comprehensive income		(10.9)		(102.5)		(6.0)
Total impact from net periodic postretirement cost and changes in other comprehensive income		(10.1)		43.0		(1.0)
Other Postretirement Benefits Plan [Member]
Net periodic postretirement cost
Service cost		0.7		0.8		0.7
Interest cost		1.8		2.8		4.0
Expected return on plan assets		0.0		0.0		(0.2)
Amortization of net actuarial loss		2.6		2.6		2.3
Amortization of prior service cost		(5.1)		(5.1)		(5.1)
Total net periodic postretirement cost		0.0		1.1		1.7
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Net actuarial (gain) loss		(8.2)		3.9		3.4
Prior service cost		0.0		0.0		1.7
Amortization of net actuarial loss		(2.6)		(2.6)		(2.3)
Amortization of prior service cost		5.1		5.1		5.1
Total change recognized in other comprehensive income		(5.7)		6.4		7.9
Total impact from net periodic postretirement cost and changes in other comprehensive income		(5.7)		7.5		9.6
United States | Pension Plan [Member]
Net periodic postretirement cost
Service cost		0.0		0.0		0.2
Interest cost		0.3		6.9		11.1
Expected return on plan assets		0.0		(7.2)		(14.8)
Amortization of net actuarial loss		0.2		4.8		4.3
Amortization of prior service cost		0.0		0.0		0.7
Net periodic postretirement cost		0.5		4.5		1.5
Pension settlement charges	[1]	(3.4)		136.9
Total net periodic postretirement cost		(2.9)		141.4		1.5
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Net actuarial (gain) loss		(0.1)		34.7		(10.2)
Amortization of net actuarial loss		(0.2)		(141.7)		(4.3)
Amortization of prior service cost		0.0		0.0		(0.7)
Foreign currency translation		0.0		0.0		0.0
Total change recognized in other comprehensive income		(0.3)		(107.0)		(15.2)
Total impact from net periodic postretirement cost and changes in other comprehensive income		(3.2)		34.4		(13.7)
International Plan [Member] | Pension Plan [Member]
Net periodic postretirement cost
Service cost		1.4		1.5		1.2
Interest cost		0.7		1.0		1.5
Expected return on plan assets		0.0		0.0		0.0
Amortization of net actuarial loss		1.6		1.5		0.8
Amortization of prior service cost		0.0		0.0		0.0
Net periodic postretirement cost		3.7		4.0		3.5
Pension settlement charges		0.0		0.1		0.0
Total net periodic postretirement cost		3.7		4.1		3.5
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Net actuarial (gain) loss		(6.3)		3.2		10.3
Amortization of net actuarial loss		(1.6)		(1.6)		(0.8)
Amortization of prior service cost		0.0		0.0		0.0
Foreign currency translation		(2.7)		2.9		(0.3)
Total change recognized in other comprehensive income		(10.6)		4.5		9.2
Total impact from net periodic postretirement cost and changes in other comprehensive income		$ (6.9)		$ 8.6		$ 12.7

[1] 2021 includes income of $3.4 from a pricing adjustment associated with the termination and sale of the U.S. qualified pension plan. In 2020, the Company recorded a settlement charge of $136.9 related to the termination and sale of the U.S. qualified pension plan.