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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information
Operating income	$ 475.8	$ 413.6	$ 1,150.1	$ 1,189.4
Stock-based compensation expense	(19.0)	(16.6)	(51.0)	(46.4)
Acquisition-related expenses	0.0	0.0	0.0	(25.4)
Other operating expenses	(14.5)	(13.9)	(42.2)	(40.5)
Interest expense	(28.0)	(29.7)	(87.1)	(89.5)
Loss on early extinguishment of debt	0.0	(14.3)	0.0	(14.3)
Other income, net	1.0	4.5	3.4	7.6
Income before income taxes	448.8	374.1	1,066.4	1,093.2
Operating Segment
Segment Reporting Information
Operating income	$ 509.3	$ 444.1	$ 1,243.3	$ 1,301.7