Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Equity [Abstract]
Treasury sock, shares, acquired	359,732
Treasury stock, value, acquired	$ 42.9
Treasury shares, acquired, tax burden	11,829
Treasury shares, acquired, value, tax burden	$ 1.3
Cash dividends per share (in dollars per share)	$ 0.55	$ 0.50	$ 1.10	$ 1.00
Dividends declared (in dollars per share)	$ 0.55