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Stockholders' Equity (Details)
$ / shares in Units, shares in Thousands, $ in Millions
1 Months Ended
Jul. 31, 2017
USD ($)
$ / shares
shares
Class of Stock [Line Items]  
Number of shares issued in transaction (in shares) 11,000
Sale of stock, price per share (USD per share) | $ / shares $ 60.50
Period after stock offering in which forward sales agreements are expected to occur 1 year
Option Granted To Underwriters  
Class of Stock [Line Items]  
Number of shares issued in transaction (in shares) 1,650
Offered Directly By The Company  
Class of Stock [Line Items]  
Number of shares issued in transaction (in shares) 5,000
Gross proceeds received | $ $ 290.4
Gross proceeds received net of fees and expenses | $ $ 287.6
Offered In Connection With Forward Sale Agreements  
Class of Stock [Line Items]  
Number of shares issued in transaction (in shares) 6,000
Sale of stock, price per share (USD per share) | $ / shares $ 58.08
JPMorgan Chase Bank, National Association, London Branch | Offered In Connection With Forward Sale Agreements  
Class of Stock [Line Items]  
Number of shares issued in transaction (in shares) 3,000
Morgan Stanley & Co. LLC | Offered In Connection With Forward Sale Agreements  
Class of Stock [Line Items]  
Number of shares issued in transaction (in shares) 3,000