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Equity and Accumulated Other Comprehensive Loss - Public Stock Offering (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 14, 2019 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Subsidiary, Sale of Stock |  |  |  |  |
Common stock, par value (usd per share) |  |  | $ 0.01 |  | $ 0.01
Proceeds form issuance of shares |  |  | $ 295.8 | $ 0.0 |
Common Stock |  |  |  |  |
Subsidiary, Sale of Stock |  |  |  |  |
New shares issued (shares) |  | 4,030,000.00 |  |  |
Public Offering | Common Stock |  |  |  |  |
Subsidiary, Sale of Stock |  |  |  |  |
New shares issued (shares) | 4,025,000.000 |  |  |  |
Common stock, par value (usd per share) | $ 0.01 |  |  |  |
Stock price (usd per share) | $ 73.50 |  |  |  |
Proceeds form issuance of shares | $ 295.8 |  |  |  |
Equity issuance cost | $ 9.5 |  |  |  |

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