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Forward Equity and Equity Distribution Program (Details) - Common Stock
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended
Jun. 30, 2016
USD ($)
$ / shares
shares
Class of Stock [Line Items]  
Stock repurchase program, authorized amount | $ $ 500.0
Underwriters  
Class of Stock [Line Items]  
Number of common shares issued (in shares) | shares 2.9
Common stock price (in dollars per share) | $ / shares $ 167.25
IPO  
Class of Stock [Line Items]  
Number of common shares issued (in shares) | shares 2.9
Common stock price (in dollars per share) | $ / shares $ 167.25