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Equity - Additional Information (Details) - USD ($) $ in Millions |  | 9 Months Ended
--- | --- | ---
Oct. 19, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Dividends Payable [Line Items] |  |  |  |
Dividend paid | [1] |  | $ 66.6 | $ 66.4
Shares repurchased under repurchase program (in shares) |  |  | 0 |
Stock repurchase program, remaining authorized repurchase amount |  |  | $ 238.8 |
Subsequent Event |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Dividend paid |  | $ 22.3 |  |
[1] | See Note 13 regarding quarterly cash dividend.

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