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Preferred and Common Stockholder's Equity - Schedule of Stock Repurchases (Detail) shares in Millions, $ in Millions | 9 Months Ended
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Mar. 31, 2019 USD ($) shares
Stockholders Equity [Line Items] |
Shares purchased and retired | shares | 1.6
Common stock and additional paid-in-capital reductions | $ | $ 16.9
Charges to retained earnings | $ | $ 33.1
Common Stock [Member] |
Stockholders Equity [Line Items] |
Shares purchased and retired | shares | 1.6

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