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Debt of the Operating Partnership (3.400% Notes Due 2020 and 4.750% Notes Due 2025) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 01, 2015
Dec. 31, 2015
Oct. 05, 2015
Debt Instrument [Line Items]      
Number of business days following consummation of acquisition by wholly owned subsidiary to merge with parent company 5 days    
Senior Notes | 3.400% Notes Due 2020 [Member]      
Debt Instrument [Line Items]      
Debt face amount $ 500.0    
Interest rate (as a percent) 3.40%   3.40%
Issuance as a percentage of par 99.777%    
Redemption price percentage   100.00%  
Senior Notes | 4.750% Notes Due 2025 [Member]      
Debt Instrument [Line Items]      
Debt face amount $ 450.0    
Interest rate (as a percent) 4.75%   4.75%
Issuance as a percentage of par 100.00%    
Redemption price percentage   100.00%