Mezzanine and Stockholders' Equity - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Class of Stock [Line Items]
Holdback shares not issued to former shareholders (in shares)			143,052
Treasury shares (in shares)	10,885,732		10,885,732		12,323,164
Shares issued for exercise of warrants (in shares)			34,158
APC
Class of Stock [Line Items]
Treasury shares (in shares)	10,885,732		10,885,732		12,323,164
Dividends paid	$ 19.9	$ 19.6	$ 19.9	$ 29.6
CDSC
Class of Stock [Line Items]
Dividends paid	$ 1.5	$ 0.6	$ 1.5	$ 0.6