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Earnings Per Share - Additional Information (Details) | Sep. 30, 2020
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4.50% Cumulative Convertible Preferred Stock |
Debt Instrument [Line Items] |
Interest rate, stated percentage | 4.50%
5.00% (2005B) |
Debt Instrument [Line Items] |
Interest rate, stated percentage | 5.00%
5.75% Cumulative Convertible Non-Voting Preferred Stock (Series A) |
Debt Instrument [Line Items] |
Interest rate, stated percentage | 5.75%
5.75% Cumulative Non-Voting Convertible Preferred Stock |
Debt Instrument [Line Items] |
Interest rate, stated percentage | 5.75%
Convertible debt | 5.5% Convertible Senior Notes due 2026 |
Debt Instrument [Line Items] |
Interest rate, stated percentage | 5.50%

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