Earnings Per Share and Capital Structure Stock Repurchase Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	2 Months Ended	3 Months Ended		4 Months Ended	6 Months Ended		0 Months Ended
	Mar. 07, 2014	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013	Mar. 09, 2013 March 8, 2013 Share Repurchase Program [Member]	Feb. 07, 2014 February 7, 2014 Share Repurchase Program [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		1,200,000	1,300,000		1,100,000	1,200,000
Stock Repurchase Program, Authorized Amount							$ 50	$ 50
Stock Repurchased and Retired During Period, Shares (in ones)	75,203			107,477
Stock Repurchased and Retired During Period, Value	2.9			4.2
Stock Repurchase Program, Remaining Authorized Repurchase Amount					$ 45.8