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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Face (par) amount of debt instrument at time of issuance.

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-Name Accounting Standards Codification

-Topic 835

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

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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No definition available.

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The cash inflow from the additional capital contribution to the entity.

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Common Stock - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
	May 31, 2013	Oct. 31, 2012	Dec. 31, 2014	Dec. 31, 2013
Overview Of The Company [Line Items]
Common stock shares sold	3,902,862us-gaap_CommonStockSharesIssued	7,964,601us-gaap_CommonStockSharesIssued	125,687,607us-gaap_CommonStockSharesIssued	123,090,990us-gaap_CommonStockSharesIssued
Cash proceeds from sale of common stock	$ 355.1	$ 222.1
Principal amount of convertible senior notes			659.8us-gaap_DebtInstrumentFaceAmount	660.0us-gaap_DebtInstrumentFaceAmount
1.50% Convertible Senior Notes [Member]
Overview Of The Company [Line Items]
Principal amount of convertible senior notes	660.0
Debt instrument interest rate	1.50%
Proceeds from convertible senior notes, net of underwriting discounts and offering costs	648.0
Chief Executive Officer [Member]
Overview Of The Company [Line Items]
Common stock shares sold	487,857	35,398
Cash proceeds from sale of common stock	45.0	1.0
Chief Executive Officer [Member] \| Private placement [Member]
Overview Of The Company [Line Items]
Common stock shares sold	596,272
Cash proceeds from sale of common stock	$ 55.0