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Equity - At-the-Market (ATM) Programs (Details) - Common stock - USD ($) $ in Millions | 1 Months Ended | 31 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2018 | Oct. 31, 2017 | Sep. 30, 2015
At-the-market (ATM) Programs |  |  |  |
Share issuances, net of costs (in shares) | 11,850,000 |  |  |
ATM |  |  |  |
At-the-market (ATM) Programs |  |  |  |
Share issuances, net of costs (in shares) |  | 14,407,529 |  |
Proceeds from At-the-Market (ATM) program |  | $ 824.8 |  |
ATM | Maximum |  |  |  |
At-the-market (ATM) Programs |  |  |  |
Shares authorized |  |  | 17,000,000 | 12,000,000

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