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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 1.3us-gaap_AllowanceForDoubtfulAccountsReceivable	$ 1.3us-gaap_AllowanceForDoubtfulAccountsReceivable
Common stock, par value (usd per share)	$ 1us-gaap_CommonStockParOrStatedValuePerShare	$ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized (shares)	90,000,000us-gaap_CommonStockSharesAuthorized	90,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (shares)	64,700,000us-gaap_CommonStockSharesIssued	64,200,000us-gaap_CommonStockSharesIssued
Treasury stock, shares (shares)	2,100,000us-gaap_TreasuryStockShares	1,700,000us-gaap_TreasuryStockShares

X

- Definition

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

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X

- Definition

Face amount or stated value per share of common stock.

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-Publisher FASB

-Name Accounting Standards Codification

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X

- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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- Definition

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.

+ References

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-Publisher FASB

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- Definition

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.

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