Earnings per Share (Notes)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Earnings Per Share [Text Block]

Earnings per Share

The numerator for both basic and diluted earnings per share is net income. The denominator for basic earnings per share is the weighted average number of common shares outstanding during the period. The dilutive effect of outstanding MPK Plan Units and Deferred Units is reflected in the denominator for diluted earnings per share using the treasury stock method. Class B Common Units are not dilutive as no incremental common shares are issued upon vesting or repurchase by the Company.

The following is a reconciliation of basic shares to diluted shares:

	Three Months Ended June 30,		Six Months Ended June 30,
(in millions)	2013	2012	2013	2012
Weighted-average shares - basic	145.3	145.1	145.2	145.0
Effect of dilutive securities	1.4	0.7	1.3	0.8
Weighted-average shares - diluted	146.7	145.8	146.5	145.8

There were no potential common shares excluded from diluted earnings per share for the three and six month periods ended June 30, 2013 and 2012.

On July 2, 2013, the Company completed an IPO of its common shares which will impact both basic and diluted earnings per share in future periods. See Note 13 for additional discussion of the Company's IPO.