v3.19.1
Equity Equity Textual (Details) - USD ($)
 3 Months Ended
Jan. 11, 2019
Mar. 29, 2019
Apr. 15, 2019
Jul. 19, 2018
Jun. 06, 2018
Feb. 12, 2018
Gross proceeds $ 460,000,000 $ 460,000,000        
Tangible Equity Units Issued, Number 4,000,000          
Tangible Equity Units Issued, State Rate Of Return 5.75% 6.50%        
Tangible Equity Unit, Quarterly Cash Distribution   $ 1.4375        
Tangible Equity Unit, Quarterly Cash Distribution, Percentage   5.75%        
Fair value per unit $ 100.00          
Stock Purchase Contracts Outstanding   4,600,000.0        
Tangible Equity Units Issued, Number, Additional Issuable 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   $ 20.81        
Tangible Equity Unit, Threshold Appreciation Price   25.00        
Tangible Equity Unit, Initial Principal Amount   $ 15.6099        
Noncontrolling Interest, Ownership Percentage by Parent   99.80%        
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests   $ 92,700,000        
Stock Repurchase Program, Authorized Amount       $ 100,000,000.0 $ 100,000,000 $ 100,000,000.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 99,997,744        
Minimum [Member]            
Shares Issued per Purchase Contract   4.0        
Tangible Equity Units, Threshold For Conversion   18,400,000        
Maximum [Member]            
Shares Issued per Purchase Contract   4.8054        
Tangible Equity Units, Threshold For Conversion   22,100,000        
Subsequent Event [Member]            
Tangible Equity Unit, Quarterly Cash Distribution     $ 1.5014