Earnings Per Share and Shareholders Equity Transactions (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share and Shareholders’ Equity Transactions [Abstract]
Antidilutive securities excluded from calculation of earnings per share	0.6	0.5	0.6
Repurchases common stock, authorized	$ 900.0	$ 900.0
Repurchases common stock, shares		1.3
Repurchases common stock, value		$ 105.2