Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2001
Share Repurchases [Abstract]
Stock Repurchase Shares Authorized					15,400,000
Share repurchase authorization increase	3,225,000		3,225,000
Treasury Stock, Shares, Acquired	0		0
Dividends, Common Stock, Cash	$ 1.8	$ 1.7	$ 3.5	$ 3.4