Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Stock-based compensation, additional disclosures [Abstract]
Stock-based compensation expense	$ 1.5	$ 1.7	$ 2.9	$ 3.5
Income tax benefit related to stock-based compensation expense	0.5	0.7	0.9	1.4
Tax benefit recorded as credits to additional paid-in capital related to stock-based compensation transactions	0.2	0.4	0.7	2.0
Shares of common stock available for grant under stock-based incentive plans (in shares)	1,300,000		1,300,000
Restricted Stock Units [Member]
Summary of Restricted Stock Units activity [Roll Forward]
Outstanding at beginning of period (in shares)			684,674
Granted (in shares)			26,860
Vested (in shares)			(35,107)
Forfeited (in shares)			(8,145)
Outstanding at end of period (in shares)	668,282		668,282
Weighted Average Measurement Date Fair Value [Abstract]
Outstanding at beginning of period (in dollars per share)			$ 16.38
Granted (in dollars per share)			$ 17.47
Vested (in dollars per share)			$ 16.59
Forfeited (in dollars per share)	$ 16.73		$ 16.73
Outstanding at end of period (in dollars per share)	$ 16.41		$ 16.41
Stock-based compensation, additional disclosures [Abstract]
Aggregate intrinsic value of restricted stock units that are expected to vest	11.3		11.3
Unrecognized compensation expense related to non-vested restricted stock units	6.1		6.1
Unrecognized compensation expense, weighted-average period of recognition (in years)			1.80
Stock Options [Member]
Summary of Stock Option activity [Roll Forward]
Outstanding at beginning of period (in shares)			1,226,582
Exercised (in shares)			(135,971)
Expired (in shares)			(5,648)
Outstanding at end of period (in shares)	1,084,963		1,084,963
Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period (in dollars per share)			$ 6.46
Exercised (in dollars per share)	$ 4.60		$ 4.60
Expired (in dollars per share)	$ 4.14		$ 4.14
Outstanding at end of period (in dollars per share)	$ 6.70		$ 6.70
Stock-based compensation, additional disclosures [Abstract]
Weighted average remaining contractual term (in years)	1.85		1.85
Intrinsic value of options exercised computed as the market price on the exercise date less the price paid to exercise the options	0.5	1.2	1.8	5.4
Cash received from exercise of options	0.1	2.2	0.6	9.7
Aggregate intrinsic value of stock options outstanding, all fully vested	$ 11.0		$ 11.0

As of the balance sheet date, the fair value of the underlying shares expected to vest using the market price at the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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As of the balance sheet date, the total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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