Reserves for Credit Losses (Details 2) - USD ($) $ in Millions		6 Months Ended
	Jan. 01, 2020	Jun. 30, 2020	Jun. 30, 2019
Allowance for Loan and Lease Losses [Roll Forward]
Balance, January 1	$ 10.0	$ 10.0
Balance, June 30		23.0
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Recoveries		1.0	$ 1.0
Cumulative Effect, Period of Adoption, Adjustment [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Increase related to adoption of CECL methodology	$ 7.0
Accounting Standards Update 2016-13 [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance, January 1	$ 17.0	17.0	5.0
Provisions		12.0	6.0
Net write-offs		(6.0)	(4.0)
Balance, June 30		$ 23.0	$ 7.0