Earnings Per Share and Capital Structure Stock Repurchase Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		2 Months Ended		3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 07, 2014 March 8, 2013 Share Repurchase Program [Member]	Mar. 08, 2013 March 8, 2013 Share Repurchase Program [Member]	Sep. 30, 2014 February 7, 2014 Share Repurchase Program [Member]	Feb. 07, 2014 February 7, 2014 Share Repurchase Program [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1,100,000	1,300,000	1,200,000	1,100,000
Stock Repurchase Program, Authorized Amount						$ 50		$ 50
Stock Repurchased and Retired During Period, Shares (in ones)					75,203		311,177
Stock Repurchased and Retired During Period, Value					2.9		12.4
Stock Repurchase Program, Remaining Authorized Repurchase Amount							$ 37.6