Earnings Per Share (Details) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Anti-dilutive shares not included in diluted common share outstanding (in shares)			0.4	0.3
Weighted-average basic common shares outstanding (in shares)	180.1	179.3	179.9	179.1
Potential number of shares issuable upon excerise of in-the-money stock options under the Long-term Stock Incentive Plan	0	0.2	0	0.3
Average diluted common shares outstanding (in shares)	180.1	179.5	179.9	179.4