Share-Based Compensation Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended		1 Months Ended			12 Months Ended					12 Months Ended
	Oct. 24, 2013	Jul. 26, 2012	May 31, 2011	Sep. 30, 2010	Feb. 28, 2010	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 2012 Equity Incentive Award Plan [Member]	May 24, 2012 2012 Equity Incentive Award Plan [Member]	Dec. 31, 2013 Employee Stock Purchase Plan [Member]	Dec. 31, 2013 Employee Stock Option [Member]	Dec. 31, 2013 Employee Stock Option [Member] 2012 Equity Incentive Award Plan [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Annual Vesting Percentage [Member] Employee Stock Option [Member] 2012 Equity Incentive Award Plan [Member]	Dec. 31, 2013 Vesting in Three Equal Installments [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Vesting in Four Equal Installments [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Vesting One-Third Annually Beginning Third Anniversary of Grant Date [Member] Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Authorized						5,000,000	5,000,000
Share Repurchase Program [Abstract]
Stock Repurchase Program, Authorized Amount	$ 120.0	$ 90.0	$ 60.0	$ 30.0	$ 15.0
Stock Repurchase Program, Additional Authorized Amount	30.0	30.0	30.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount						25.8
Stock Repurchased During Period, Shares						2,400,000
Stock Repurchased During Period, Value						23.3
Incentive Award Plans [Abstract]
Reduction in shares available for issuance under the current plan for shares issued under the prior plan									2
Number of shares reserved for future issuance									3,600,000	6,000,000
Options exercisable and expected to vest						6,514,513
Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term						5 years 7 months 10 days
Estimated intrinsic value of options exercisable and expected to vest						4.4
Vesting percentage															20.00%	5.00%	69.00%	26.00%
Vesting Period																3 years	4 years
Term of stock option grant													10 years
Weighted average fair values of options granted						$ 2.86	$ 2.96	$ 4.36
Aggregate intrinsic value of options exercised						1.2	1.0	4.6
Cash Received from Exercise of Stock Options						4.0	3.3	11.7
Net tax benefit realized from exercise of non-qualified stock options and disqualifying dispositions of incentive stock options						0.5	0.2	0.5
Share Price						$ 9.87
Intrinsic value of outstanding options						4.6
Intrinsic value of exercisable options						3.9
RSUs expected to vest														1,100,000
RSUs, Outstanding, Weighted Average Remaining Contractual Terms														2 years 10 months 29 days
RSUs, Aggregate Intrinsic Value, Nonvested														10.5
Capitalized share-based compensation included in inventory						0.2	0.1
Nonvested Awards, Compensation Not yet Recognized, Stock Options						6.8
Aggregate intrinsic value of RSU's expected to vest														8.1
Aggregate Intrinsic Value of Vested RSUs						$ 2.1
Compensation cost not yet recognized, period for recognition												2 years 9 months 16 days		3 years 7 days
Employee Stock Purchase Plan [Abstract]
Discounted market value of stock, percent											95.00%
Number of shares reserved for issuance under the plan											2,000,000
Stock issued during the period under the plan						100,000	100,000	100,000
Weighted average purchase price per share of shares purchased						$ 9.32	$ 9.40	$ 10.21