Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Principal amount	$ 125.6	$ 243.6
Common stock, units issued	80,408,702	67,761,012
Common stock, units outstanding	80,408,702	67,761,012
3.875% senior notes due 2023
Senior notes percentage	3.875%	3.875%
5.625% senior notes due 2043
Senior notes percentage	5.625%	5.625%

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Contractual interest rate for funds borrowed, under the debt agreement.

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