Share-Based Payments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	$ 47.8	$ 40.4	$ 151.8	$ 128.0
Subtotal	49.6	50.4	182.0	143.6
Capitalized share-based compensation costs	(1.7)	(3.5)	(7.8)	(9.7)
Share-based compensation expense included in total costs and expenses	47.9	46.9	174.2	133.9
Income tax effect	(8.1)	(7.7)	(29.1)	(21.8)
Research and development
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	15.4	21.0	65.2	60.5
Selling, general and administrative
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	34.2	29.4	116.8	83.1
Total share-based compensation expense, net of tax
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	$ 39.8	$ 39.2	$ 145.1	$ 112.1