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Dividends (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 05, 2019 | Feb. 05, 2019 | Dec. 05, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Dividends paid per common share (in usd per share) |  |  | $ 0.3645 |  |  |  |
Dividends declared per common share (in usd per share) |  |  |  | $ 0.3645 | $ 0.3625 | $ 1.092 | $ 1.086
Dividends, common stock |  |  | $ 86.3 |  |  |  |
Subsequent event |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Dividends declared per common share (in usd per share) |  | $ 0.3650 |  |  |  |  |
Scenario forecast |  |  |  |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |  |  |  |
Dividends, common stock | $ 86.8 |  |  |  |  |  |

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