CONSOLIDATED BALANCE SHEETS - Parenthetical (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current Assets:
Allowance for doubtful accounts	$ 4.2	$ 7.2
Other Assets:
Accumulated amortization of intangible assets	$ 178.6	$ 127.3
Stockholders' Equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	90,000,000	90,000,000
Common stock, shares issued (in shares)	15,682,746	15,471,150
Treasury stock, shares (in shares)	263,145	172,685