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Equity Equity Textual (Details)
6 Months Ended
Jan. 11, 2019
USD ($)
$ / shares
shares
Jun. 28, 2019
USD ($)
$ / shares
shares
Apr. 15, 2019
$ / shares
Jul. 19, 2018
USD ($)
Jun. 06, 2018
USD ($)
Feb. 12, 2018
USD ($)
Gross proceeds $ 460,000,000 $ 460,000,000.0        
Tangible Equity Units Issued, Number | shares 4,000,000          
Tangible Equity Units Issued, State Rate Of Return 5.75% 6.50%        
Tangible Equity Unit, Quarterly Cash Distribution | $ / shares   $ 1.4375 $ 1.5014      
Tangible Equity Unit, Quarterly Cash Distribution, Percentage   5.75%        
Fair value per unit | $ / shares $ 100          
Stock Purchase Contracts Outstanding | shares   4,600,000        
Tangible Equity Units Issued, Number, Additional Issuable | shares 600,000          
Tangible Equity Units Issued, Cash Proceeds $ 447,700,000          
Prepaid Stock Purchase Contracts, Fair Value   $ 377,800,000        
Tangible Equity Units Issued, Fair Value   69,900,000        
Tangible Equity Units Issued, Noncurrent   47,300,000        
Tangible Equity Units Issued, Current   $ 22,600,000        
Tangible Equity Unit, Reference Price | $ / shares   $ 20.81        
Tangible Equity Unit, Threshold Appreciation Price | $ / shares   25.00        
Tangible Equity Unit, Initial Principal Amount | $ / shares   $ 15.6099        
Stock Repurchase Program, Authorized Amount       $ 100,000,000 $ 100,000,000 $ 100,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 100,000,000.0        
Minimum [Member]            
Shares Issued per Purchase Contract   4.0000        
Tangible Equity Units, Threshold For Conversion | shares   18,400,000        
Maximum [Member]            
Shares Issued per Purchase Contract   4.8054        
Tangible Equity Units, Threshold For Conversion | shares   22,100,000