Leases - Summary of Balance Sheet Classifications of Operating and Finance Leases (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leases:
Operating lease, right of use asset	$ 453.0	$ 481.9
Current operating lease liabilities	48.6	52.7
Noncurrent operating lease liabilities	410.4	433.9
Total operating lease liabilities	459.0	486.6
Finance Leases:
Property, plant and equipment	37.8	18.3
Accumulated depreciation	(6.9)	(3.1)
Property, plant and equipment, net	30.9	15.2
Other current liabilities	3.3	2.8
Other noncurrent liabilities	21.2	5.9
Total finance lease liabilities	$ 24.5	$ 8.7