Leases - Schedule of Information on Leases (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Leases [Abstract]
Lease cost	$ 76.0	$ 72.2	$ 87.2
Cash paid for leases recognized in operating cash flows	73.6
Right-of-use assets obtained in exchange for new lease liabilities	55.0
Right-of-use assets recognized in Other assets	$ 266.7			$ 274.7
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets			us-gaap:OtherAssetsNoncurrent
Lease liabilities recognized in Other current liabilities	$ 64.2			$ 62.2
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent			us-gaap:OtherLiabilitiesCurrent
Lease liabilities recognized in Other long-term liabilities	$ 215.5			$ 221.2
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent			us-gaap:OtherLiabilitiesNoncurrent
Weighted-average remaining lease term	6 years 3 months 18 days
Weighted-average discount rate	2.70%