XML 66 R56.htm IDEA: XBRL DOCUMENT v3.21.2
Recent Authoritative Accounting Guidance (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total stockholders’ equity $ 1,970.9 $ 1,933.4 $ 1,959.8 $ 1,998.9 $ 1,956.1 $ 2,013.9
Off-Balance Sheet, Credit Loss, Liability 3.4 3.4 3.7 2.3 2.1 0.0
Retained earnings            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Total stockholders’ equity $ 1,005.2 $ 988.2 $ 962.1 $ 912.5 $ 897.6 $ 953.6