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Summary of Significant Accounting Policies - Fair Value Textual (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended 0 Months Ended 0 Months Ended
Nov. 03, 2012
Oct. 29, 2011
Jun. 30, 2009
5.0% Senior unsecured notes due July 1, 2014 [Member]
Nov. 03, 2012
5.0% Senior unsecured notes due July 1, 2014 [Member]
Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Apr. 04, 2011
3.0% Senior unsecured notes due April 15, 2016 [Member]
Nov. 03, 2012
3.0% Senior unsecured notes due April 15, 2016 [Member]
Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Oct. 29, 2011
3.0% Senior unsecured notes due April 15, 2016 [Member]
Nonrecurring [Member]
Fair Value, Inputs, Level 1 [Member]
Dec. 22, 2010
Term Loan Facility [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Cash and held to maturity investments $ 38.9 $ 31.6            
Aggregate principal amount of debt 375.0   375.0   375.0     145.0
Interest rate to be paid on long term notes 5.00%   5.00%   3.00%      
Maturity date of senior unsecured notes     Jul. 01, 2014   Apr. 15, 2016     Dec. 22, 2013
Debt instrument, frequency of periodic payment     semi-annual fixed interest payments due on January 1 and July 1 of each year, commencing   semi-annual fixed interest payments due on April 15 and October 15 of each year, commencing      
Long-term debt, fair value       $ 402.5   $ 402.3 $ 392.8