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Summary of Signitifcant Accounting Policies - Earnings per Share (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options and securities not included in the computation of diluted earnings per share	1.7	0.5
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options and securities not included in the computation of diluted earnings per share	1.0	4.4	4.1

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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