Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Treasury sock, shares, acquired	268,594		1,311,616
Treasury stock, value, acquired	$ 28.7		$ 144.5
Treasury shares, acquired, tax burden	5,295		23,773
Treasury shares, acquired, value, tax burden	$ 0.6		$ 2.6
Stock Issued During Period, Shares, Treasury Stock Reissued	19,139		81,913
Stock Repurchased During Period, Shares			1,250,000
Cash dividends per share (in dollars per share)	$ 0.55	$ 0.50	$ 1.65	$ 1.50
Dividends declared (in dollars per share)	$ 0.55