Supplemental Cash Flow Information - Schedule of Noncash Investing and Financing Activities (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Supplemental Cash Flow Elements [Abstract]
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 7.0	$ 158.8
Right-of-use assets obtained in exchange for new operating lease liabilities	13.0	13.2
Accrued liabilities for purchases of property, plant and equipment	27.3	29.5
Remeasurement of operating lease right-of-use assets	(3.5)	$ (6.3)
Remeasurement of finance lease right-of-use assets	$ 6.4