Recent Authoritative Accounting Guidance (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total stockholders’ equity	$ 3,441.1	$ 1,986.6	$ 1,933.4	$ 1,959.8
Off-Balance Sheet, Credit Loss, Liability	6.2	3.8	3.4	3.7
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total stockholders’ equity	$ 974.5	$ 1,052.6	$ 988.2	$ 962.1