Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Jun. 30, 2016	Mar. 31, 2016
Equity [Abstract]
Common stock issued under stock compensation plan (in shares)	1,511,640
Stock repurchased (in shares)	1,473,403
Net decrease in period (in shares)	38,237
Increase in quarterly cash dividend rate (in dollars per share)		$ 0.005
Dividends declared (in dollars per share)	$ 0.09		$ 0.085
Dividends declared	$ 25.9