Investments Investments Finance Lease Receivables (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross minimum lease receivables	$ 39.4	$ 41.8
Allowance for credit losses	(0.2)	(0.3)
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	39.4	41.7
Unearned interest income	(2.0)	(2.8)
Unearned residuals	(0.2)	0.0
Capital Leases Net Investment In Sales Type Leases Unearned Interest Income And Residuals	(2.2)	(2.8)
Total	$ 37.2	$ 38.9