CONSOLIDATED BALANCE SHEETS - Parenthetical (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Allowance for doubtful accounts	$ 3.7	$ 4.2
Other Assets:
Accumulated amortization of intangible assets	$ 210.9	$ 178.6
Stockholders' Equity:
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock authorized (in shares)	10,000,000us-gaap_PreferredStockSharesAuthorized	10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock issued (in shares)	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred stock outstanding (in shares)	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	90,000,000us-gaap_CommonStockSharesAuthorized	90,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued (in shares)	16,986,493us-gaap_CommonStockSharesIssued	16,150,794us-gaap_CommonStockSharesIssued
Treasury stock, shares (in shares)	732,340us-gaap_TreasuryStockShares	263,145us-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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