Equity, Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Expense incurred for stock-based compensation plans									$ 63.0	$ 55.6	$ 49.7
Recognized tax benefit related to stock-based compensation									46.0	27.5	78.3
Excess tax benefit from option exercises	$ 16.8	$ 1.6	$ 12.9	$ 6.8	$ 5.7	$ 7.0	$ 3.0	$ 4.1	38.1	19.8	66.6
Selling, General and Administrative Expenses
Expense incurred for stock-based compensation plans									$ 63.0	$ 55.6	$ 49.7