Segment Reporting - Reconciliation of Consolidated Segment Earnings to Consolidated Income Before Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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	$ 454.1	$ 1,070.2	$ 1,654.1
Interest expense	99.6	92.0	84.1
Other expense, net	55.2	24.6	31.6
Consolidated income before provision for income taxes and equity in net income of affiliates	299.3	953.6	1,538.4
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	688.6	1,327.5	1,892.1
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	$ (234.5)	$ (257.3)	$ (238.0)