Share-Based Payments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	$ (49.5)	$ (55.0)	$ (118.8)	$ (104.0)
Subtotal	45.5	82.9	121.9	132.4
Capitalized share-based compensation costs	(1.5)	(2.8)	(3.0)	(6.1)
Share-based compensation expense included in total costs and expenses	44.0	80.1	118.9	126.3
Income tax effect	(7.0)	(13.6)	(20.3)	(21.0)
Research and development
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	15.2	28.1	48.5	49.8
Selling, general and administrative
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	30.3	54.8	73.4	82.6
Total share-based compensation expense, net of tax
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	$ 37.0	$ 66.5	$ 98.6	$ 105.3