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Subsequent Events	12 Months Ended
Subsequent Events	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Dividends Declared On February 21, 2019, the Company declared a quarterly cash dividend of $0.55 per common share to be paid on May 15, 2019 to shareholders of record at the close of business on April 30, 2019. The Company also declared a quarterly cash dividend of $1.8125 per share on the Company's 7.25% mandatory convertible preferred stock to be paid on May 1, 2019 to shareholders of record at the close of business on April 15, 2019.