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Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 06, 2019 | Oct. 22, 2019 | Jun. 13, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Nov. 21, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  | 450,000,000 |  | 450,000,000 |  |  | 450,000,000 |  |  |
Common stock, par value per share |  |  |  |  | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |
Common Stock, Shares Issued |  |  |  |  | 143,524,043 |  | 143,524,043 |  |  | 140,239,977 |  |  |
Common Stock, Shares Outstanding |  |  |  |  | 143,524,043 |  | 143,524,043 |  |  | 140,239,977 |  |  |
Preferred Stock, Shares Authorized |  |  |  |  | 50,000,000 |  | 50,000,000 |  |  |  |  |  |
Preferred stock, par value per share |  |  |  |  | $ 0.01 |  | $ 0.01 |  |  |  |  |  |
Preferred Stock, Shares Issued |  |  |  |  | 0 |  | 0 |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  | 0 |  | 0 |  |  |  |  |  |
Restriction for disposition of assets acquired |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Distributions to holders of Class A equity interests of a subsidiary |  |  |  |  |  |  | $ 156.0 | $ 152.9 |  |  |  |  |
Stock Issued During Period, Shares, Issued for Services |  |  |  |  |  |  | 8,166 |  |  |  |  |  |
Stock Issued During Period, Value, Issued for Services |  |  |  |  |  | $ 0.1 | $ 0.1 | $ 0.1 |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  |  |  | $ 0.36 | $ 0.36 | $ 1.08 | $ 1.08 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  | Oct. 22, 2019 |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  | $ 0.36 |  |  |  |  |  |  |  |  |  |
Ordinary dividend | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date of Record |  | Dec. 06, 2019 |  |  |  |  |  |  |  |  |  |  |
At-The-Market Equity Offering Program |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
At-The-Market Equity Offering Program, Authorized Amount Outstanding |  |  |  |  | $ 232.5 |  | $ 232.5 |  |  |  |  |  | $ 300.0
Shares issued under the ATM Program |  |  |  |  | 0 |  | 2,150,000 |  |  |  |  |  |
Shares issued under the ATM Program (value) |  |  |  |  |  |  | $ 52.0 |  |  |  |  |  |
Payments of Stock Issuance Costs |  |  |  |  |  |  | 0.8 |  |  |  |  |  |
Sale of Stock, Consideration Received on Transaction |  |  |  |  |  |  | $ 51.2 |  |  |  |  |  |
Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest issued for an acquisition (in shares) |  |  |  |  |  |  | 1,953,407 |  |  |  |  |  |
Distributions to holders of Class A equity interests of a subsidiary |  |  |  |  | $ 0.4 | $ 0.6 | $ 1.5 | $ 2.0 |  |  |  |  |
Equity interests redeemed during the period |  |  |  |  |  |  | 774,727 |  |  |  |  |  |

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