Investments Investments Finance Lease Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross minimum lease receivables	$ 46.7	$ 44.0
Allowance for credit losses	(0.3)	(0.2)
Estimated unguaranteed residual values	0.2	0.2
Capital Leases Net Investment In Sales Type Leases Minimum Payments To Be Received And Unguaranteed Residual Values	46.6	44.0
Unearned interest income	(1.4)	(1.5)
Total	$ 45.2	$ 42.5