Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended			3 Months Ended		9 Months Ended
	Jul. 13, 2018	Aug. 31, 2018	May 31, 2018	Feb. 28, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Equity [Abstract]
Treasury stock, shares, acquired					6,736		42,994
Treasury stock, value					$ 0.8		$ 4.8
Treasury shares, acquired, tax burden					6,736		22,994
Treasury shares, acquired, value, tax burden					$ 0.8		$ 2.5
Treasury stock reissued					23,931		79,520
Cash dividends per share (in dollars per share)		$ 0.55	$ 0.55	$ 0.55	$ 0.55	$ 0.55	$ 1.65	$ 1.65
Dividends payable, date declared	Oct. 09, 2018
Dividends declared (in dollars per share)	$ 0.55
Dividends payable, date of record	Oct. 19, 2018
Dividends payable, date to be paid	Nov. 20, 2018