Consolidated Balance Sheet Parenthetical (USD $) In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Accounts Receivable, Net [Abstract]
Accounts Receivable, Allowance	$ 1.0	$ 0.9
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock, Par Value	$ 0.00	$ 0.00
Common Stock, Shares Authorized	80.0	80.0
Common Stock, Shares Outstanding	38.1	37.5