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Fair Value (Details Textual) - USD ($)
$ in Millions
1 Months Ended
Aug. 29, 2014
Jun. 30, 2013
Apr. 30, 2011
Aug. 01, 2015
Nov. 01, 2014
Jul. 22, 2014
Jun. 03, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Debt Instrument, Maturity Date Aug. 29, 2014            
Fair Value (Textual) [Abstract]              
Cash and held to maturity investments       $ 81.9 $ 121.3    
Short-term Debt           $ 2,000.0  
3.0% Senior unsecured notes due April 15, 2016 [Member]              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Debt Instrument, Frequency of Periodic Payment     semi-annual fixed interest payments due on April 15 and October 15 of each year, commencing October 15, 2011        
Debt Instrument, Maturity Date     Apr. 15, 2016        
2.875% Senior unsecured notes due June 1, 2023 [Member]              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Debt Instrument, Frequency of Periodic Payment   semi-annual fixed interest payments due on June 1 and December 1 of each year, commencing December 1, 2013          
Debt Instrument, Maturity Date   Jun. 01, 2023          
Fair Value, Measurements, Recurring [Member]              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Amortized cost of the Company's investments classified as available for sale       2,700.0 2,300.0    
Financial Instruments Not Recorded at Fair Value on a Recurring Basis [Member] | 3.0% Senior unsecured notes due April 15, 2016 [Member]              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Fair value of the long-term debt       380.8 386.3    
Aggregate principal amount of debt     $ 375.0        
Interest rate to be paid on long term notes     3.00%        
Financial Instruments Not Recorded at Fair Value on a Recurring Basis [Member] | 2.875% Senior unsecured notes due June 1, 2023 [Member]              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Fair value of the long-term debt       $ 481.4 $ 483.5    
Aggregate principal amount of debt             $ 500.0
Interest rate to be paid on long term notes             2.875%