Reportable Business Segments, Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information
Operating income	$ 357.4	$ 399.5	$ 674.3	$ 775.7
Stock-based compensation expense	(16.6)	(15.4)	(32.0)	(29.8)
Acquisition-related expenses	0.0	(8.9)	0.0	(25.4)
Other operating expenses	(13.9)	(13.3)	(27.7)	(26.7)
Interest expense	(30.2)	(30.0)	(59.0)	(59.7)
Other income, net	1.3	0.1	2.4	3.1
Income before income taxes	328.5	369.6	617.7	719.1
Operating Segment
Segment Reporting Information
Operating income	$ 387.9	$ 437.1	$ 734.0	$ 857.6