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Preferred and Common Stockholder's Equity - Schedule of Stock Repurchases (Detail) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016
Stockholders Equity [Line Items] |  |  |
Shares purchased and retired |  | 1.6 | 2.9
Common stock and additional paid-in-capital reductions | $ 11.2 | $ 14.5 | $ 26.0
Charges to retained earnings | $ 33.3 | $ 17.1 | $ 81.9
Common Stock [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Shares purchased and retired | 1.2 | 1.6 | 2.9

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