Share-Based Payments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	$ (35.4)	$ (47.8)	$ (154.2)	$ (151.8)
Subtotal	39.6	49.6	161.5	182.0
Capitalized share-based compensation costs	(1.9)	(1.7)	(4.9)	(7.8)
Share-based compensation expense included in total costs and expenses	37.7	47.9	156.6	174.2
Income tax effect	(5.4)	(8.1)	(25.7)	(29.1)
Research and development
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	14.6	15.4	63.1	65.2
Selling, general and administrative
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	25.0	34.2	98.4	116.8
Total share-based compensation expense, net of tax
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	$ 32.3	$ 39.8	$ 130.9	$ 145.1