Commitments and Contingencies (Details) $ in Millions	Mar. 31, 2018 USD ($) Annuity_Policy
Loss Contingencies [Line Items]
Number of annuity policies \| Annuity_Policy	2
New Loans
Loss Contingencies [Line Items]
Other commitment	$ 16.2
Existing Loans
Loss Contingencies [Line Items]
Other commitment	1.2
Pending Litigation \| Damaris Maldonado Vinas Et Al
Loss Contingencies [Line Items]
Loss contingency accrual	$ (2.9)

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

No definition available.

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant