Segment Reporting - Reconciliation of Consolidated Segment Earnings to Consolidated Income Before Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated income before interest, other expense, provision for income taxes and equity in net income of affiliates	$ 1,070.2	$ 1,654.1	$ 1,608.3
Interest expense	92.0	84.1	85.7
Other (income) expense, net	24.6	31.6	(4.1)
Consolidated income before provision for income taxes and equity in net income of affiliates	953.6	1,538.4	1,526.7
Operating segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated income before interest, other expense, provision for income taxes and equity in net income of affiliates	1,327.5	1,892.1	1,892.4
Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Consolidated income before interest, other expense, provision for income taxes and equity in net income of affiliates	$ (257.3)	$ (238.0)	$ (284.1)