Lease Commitments - Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Assets
Operating Lease Right-of-Use Asset	$ 531.2	$ 560.5
Liabilities
Operating Lease Liability	$ 663.1	$ 700.6
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets	Other Assets
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Other Liabilities	Other Liabilities