Equity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity [Abstract]
Stock repurchased (in shares)				8.2
Common stock issued under stock compensation plan (in shares)				1.9
Issuance of common stock related to acquisitions (in shares)				0.1
Net decrease in period (in shares)				6.2
Increase in quarterly dividend rate (in dollars per share)		$ 0.005
Dividends declared (in dollars per share)	$ 0.120		$ 0.115	$ 0.360	$ 0.345
Dividends declared	$ 29.4