Recent Accounting Pronouncements Recent Accounting Pronouncements (Details) - Pro Forma $ in Millions	Jan. 01, 2018 USD ($)
Minimum
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cumulative effect adjustment on retained earnings	$ 1.0
Maximum
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cumulative effect adjustment on retained earnings	$ 1.5

Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

No definition available.

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