Share-Based Payments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	$ 55.0	$ 41.4	$ 104.0	$ 87.6
Subtotal	82.9	42.8	132.4	93.2
Capitalized share-based compensation costs	(2.8)	(2.8)	(6.1)	(6.2)
Share-based compensation expense included in total costs and expenses	80.1	40.0	126.3	87.0
Income tax effect	(13.6)	(6.5)	(21.0)	(14.1)
Research and development
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	28.1	17.6	49.8	39.5
Selling, general and administrative
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	54.8	25.2	82.6	53.7
Total share-based compensation expense, net of tax
Share-based Compensation Expense included in consolidated statements of income
Share-based compensation expense	$ 66.5	$ 33.5	$ 105.3	$ 72.9