Selected Quarterly Data - Schedule Of Selected Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]
Total revenue	$ 1,277.7	$ 1,128.2	$ 1,098.9	$ 973.7	$ 1,046.5	$ 920.9	$ 909.3	$ 847.5	$ 4,478.5	$ 3,724.2	$ 3,138.2
Gross profit	896.0	785.6	759.0	669.6	735.7	642.3	632.3	593.8	3,110.2	2,604.1	2,202.0
Net income	$ 357.7	$ 396.8	$ 318.3	$ 306.5	$ 292.5	$ 292.5	$ 255.3	$ 287.6	$ 1,379.3	$ 1,127.9	$ 670.9
Basic net income per share (usd per share)	$ 3.09	$ 3.44	$ 2.76	$ 2.67	$ 2.56	$ 2.57	$ 2.25	$ 2.55	$ 11.95	$ 9.92	$ 6.01
Diluted net income per share (usd per share)	$ 2.99	$ 3.33	$ 2.67	$ 2.56	$ 2.45	$ 2.45	$ 2.15	$ 2.44	$ 11.54	$ 9.49	$ 5.77
Excess tax benefits related to share-based compensation arrangements	$ 33.7	$ 28.8	$ 11.3	$ 72.7	$ 15.8	$ 24.1	$ 21.6	$ 54.7	$ 146.5	$ 116.2	$ 102.8
One-time tax benefit related to the enactment of Swiss tax reform	0.0	51.3	0.0	0.0	2.5	4.6	0.0	0.0
Includes acquisition-related benefits (charges)	(3.1)	3.0	(4.1)	(3.0)
Includes pre-tax litigation (charges)					0.0	1.8	(42.5)	(4.5)
Includes charitable foundation contribution expense	$ (5.0)	$ 0.0	$ 0.0	$ 0.0	$ (25.2)	$ 0.0	$ 0.0	$ 0.0