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Equity - Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 21, 2016 | Mar. 31, 2016 | Mar. 31, 2015
Subsequent Event [Line Items] |  |  |  |
Dividend paid | [1] |  | $ 22.1 | $ 20.1
Stock repurchase program, remaining authorized repurchase amount |  |  | $ 250.0 |
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Dividend paid |  | $ 22.2 |  |
Dividends payable, date to be paid |  | Apr. 21, 2016 |  |
[1] | See Note 13 regarding quarterly cash dividend.

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