Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Post-retirement obligations	$ 2.7	$ 5.7
Tax credits	1.1	1.8
Expenses not currently deductible	37.1	28.7
Net operating loss carryover	6.5	6.0
Debt and derivative instruments	1.4	8.6
Operating lease liabilities	9.9	12.1
Other	2.2	15.2
Total deferred tax assets	60.9	78.1
Valuation allowance for deferred tax assets	(4.2)	(4.3)
Net deferred tax assets	56.7	73.8
Deferred tax liabilities:
Property, plant and equipment	19.7	35.7
Intangible assets	217.8	256.6
Goodwill	11.2	9.9
Operating lease right of use asset	9.7	11.6
Other	7.6	8.2
Total deferred liabilities	266.0	322.0
Net deferred tax liabilities	$ 209.3	$ 248.2