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Selected Quarterly Data - Schedule Of Selected Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Selected Quarterly Financial Information [Abstract]
Total revenue	$ 1,046.5	$ 920.9	$ 909.3	$ 847.5	$ 892.0	$ 807.8	$ 758.8	$ 679.6	$ 3,724.2	$ 3,138.2	$ 2,706.5
Gross profit	735.7	642.3	632.3	593.8	634.0	568.1	530.1	469.8	2,604.1	2,202.0	1,892.9
Net income	$ 292.5	$ 292.5	$ 255.3	$ 287.6	$ (31.5)	$ 298.6	$ 223.0	$ 180.8	$ 1,127.9	$ 670.9	$ 738.3
Basic net income per share (usd per share)	$ 2.56	$ 2.57	$ 2.25	$ 2.55	$ (0.28)	$ 2.67	$ 2.01	$ 1.62	$ 9.92	$ 6.01	$ 6.43
Diluted net income per share (usd per share)	$ 2.45	$ 2.45	$ 2.15	$ 2.44	$ (0.28)	$ 2.56	$ 1.94	$ 1.57	$ 9.49	$ 5.77	$ 6.26
Income tax (expense) related to the 2017 Tax Act					$ (317.8)	$ 0.0	$ 0.0	$ 0.0
Excess tax benefits related to share-based compensation arrangements	$ 15.8	$ 24.1	$ 21.6	$ 54.7	19.9	19.7	30.6	32.6	$ 116.2	$ 102.8	$ 0.0
Certain one-time tax benefits	2.5	4.6	0.0	0.0	0.0	68.4	0.0	0.0
Includes pre-tax litigation (charges)	0.0	1.8	(42.5)	(4.5)	$ 1.2	$ (9.7)	$ 4.5	$ (21.3)
Includes charitable foundation contribution expense	$ (25.2)	$ 0.0	$ 0.0	$ 0.0

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