Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets, Current [Abstract]
Allowance for doubtful accounts receivable	$ 2.5	$ 3.9
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Preferred Stock, par value (per share)	$ 0.01	$ 0.01
Preferred Stock, shares authorized (in shares)	2,000,000us-gaap_PreferredStockSharesAuthorized	2,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, shares issued (in shares)	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred Stock, shares outstanding (in shares)	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common Stock, par value (per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	90,000,000us-gaap_CommonStockSharesAuthorized	90,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, shares issued (in shares)	32,408,222us-gaap_CommonStockSharesIssued	32,304,490us-gaap_CommonStockSharesIssued
Treasury Shares (in shares)	2,136,116us-gaap_TreasuryStockShares	825,956us-gaap_TreasuryStockShares

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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