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Earnings Per Share - Additional Disclosures (Details) (USD $) In Millions, unless otherwise specified		3 Months Ended	6 Months Ended
	Feb. 11, 2008	Jun. 30, 2013 Stock Options [Member]	Jun. 30, 2013 Stock Options [Member]	Feb. 15, 2013 2008 Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock included in share lending agreement	3.8
Notes repurchased				$ 5.2
Anti-dilutive securities excluded from calculation of earnings per share		0.1	0.1

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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