Reportable Business Segments, Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information
Operating income	$ 571.2	$ 475.8	$ 1,512.2	$ 1,150.1
Stock-based compensation expense	(21.2)	(19.0)	(60.2)	(51.0)
Acquisition-related expenses	0.0	0.0	(55.4)	0.0
Other operating expenses	(15.5)	(14.5)	(44.5)	(42.2)
Interest expense	(29.0)	(28.0)	(86.7)	(87.1)
Other income (expense), net	0.0	1.0	(0.3)	3.4
Income from continuing operations before income taxes	542.2	448.8	1,425.2	1,066.4
Operating Segment
Segment Reporting Information
Operating income	$ 607.9	$ 509.3	$ 1,672.3	$ 1,243.3