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Preferred and Common Stockholder's Equity - Schedule of Stock Repurchases (Detail) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Stockholders Equity [Line Items] |  |  |  |
Shares purchased and retired |  |  | 1.6 | 1.7
Common stock and additional paid-in-capital reductions | $ 5.4 | $ 5.4 | $ 14.5 | $ 14.9
Charges to retained earnings | $ 4.8 | $ 20.0 | $ 17.1 | $ 48.5
Common Stock [Member] |  |  |  |
Stockholders Equity [Line Items] |  |  |  |
Shares purchased and retired | 0.6 | 0.6 | 1.6 | 1.7

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