Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2015

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		9 Months Ended		12 Months Ended
	September 30,		September 30,		September 30,
	2015	2014	2015	2014	2015	2014
	(in millions)
Weighted-average basic common shares outstanding	176.2	175.8	176.3	175.8	176.2	175.7
Potential number of shares issuable under the Company's LTSIP	0.1	0.3	0.2	0.3	0.2	0.3
Weighted-average diluted common shares outstanding	176.3	176.1	176.5	176.1	176.4	176.0