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Subsequent Events (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
1 Months Ended
Jul. 31, 2017
Jun. 30, 2017
Subsequent Event    
Subsequent Event [Line Items]    
Number of shares issued in transaction (in shares) 11,000  
Sale of stock, price per share (USD per share) $ 60.50  
Period after stock offering in which forward sales agreements are expected to occur 1 year  
Option Granted To Underwriters | Subsequent Event    
Subsequent Event [Line Items]    
Number of shares issued in transaction (in shares) 1,650  
Offered Directly By The Company | Subsequent Event    
Subsequent Event [Line Items]    
Number of shares issued in transaction (in shares) 5,000  
Sale of stock, consideration received $ 290.4  
Offered In Connection With Forward Sale Agreements | Subsequent Event    
Subsequent Event [Line Items]    
Number of shares issued in transaction (in shares) 6,000  
Sale of stock, price per share (USD per share) $ 58.08  
Morgan Stanley & Co. LLC | Offered In Connection With Forward Sale Agreements | Subsequent Event    
Subsequent Event [Line Items]    
Number of shares issued in transaction (in shares) 3,000  
JPMorgan Chase Bank, National Association, London Branch | Offered In Connection With Forward Sale Agreements | Subsequent Event    
Subsequent Event [Line Items]    
Number of shares issued in transaction (in shares) 3,000  
Senior notes due 2018    
Subsequent Event [Line Items]    
Stated interest rate   7.25%