Earnings Per Common Share and Stockholders' Equity (Brookfield Asset Management Equity Investment) (Details)	Sep. 30, 2021	Nov. 30, 2020 boardOfDirectorsSeats $ / shares shares	Oct. 18, 2020 numberOfStages $ / shares
Third party equity investment, number of stages | numberOfStages			2
Third party ownership interest in Company's common stock	9.50%
Number of Board of Directors seats third party received following initial equity investment | boardOfDirectorsSeats		1
Initial Purchase
Third party ownership interest in Company's common stock		9.90%
Third party ownership interest in Company's common stock, price per share		$ 37.00
Third party ownership interest in Company's common stock, shares | shares		9,106,042
Maximum
Expected future third party ownership interest in Company's common stock			19.90%
Maximum | Second Purchase
Expected future third party ownership interest in Company's common stock			10.00%
Minimum
Expected future third party ownership interest in Company's common stock			15.00%
Minimum | Second Purchase
Expected future third party ownership interest in Company's common stock, price per share			$ 37.00