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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	153.0us-gaap_CommonStockSharesAuthorized	153.0us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding	55.8us-gaap_CommonStockSharesOutstanding	53.9us-gaap_CommonStockSharesOutstanding
Treasury stock, shares	1.2us-gaap_TreasuryStockShares	1.0us-gaap_TreasuryStockShares

X

- Definition

Face amount or stated value per share of common stock.

+ References

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-Name Accounting Standards Codification



-Topic 210



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-Section S99



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X

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



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X

- Definition

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

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



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-Name Regulation S-X (SX)



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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

+ References

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



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