Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares

A reconciliation of the components of basic and diluted shares used in the EPS calculation follows:

	3 Months Ended		6 Months Ended		12 Months Ended
	June 30,		June 30,		June 30,
	2013	2012	2013	2012	2013	2012
	(in millions)
Weighted-average basic common shares outstanding	175.5	177.2	175.4	177.8	175.3	177.7
Potential number of shares issuable under the Company's LTSIP	0.8	1.1	0.8	1.1	0.8	1.2
Weighted-average diluted common shares outstanding	176.3	178.3	176.2	178.9	176.1	178.9