Acquisition - Intangible Assets Acquired (Details) $ in Millions	Jul. 10, 2017 USD ($)
Farner-Bocken Company
Business Acquisition [Line Items]
Fair Value in Millions	$ 20.5
Customer relationships | Farner-Bocken Company
Business Acquisition [Line Items]
Fair Value in Millions	$ 17.6
Customer relationships | Minimum | Farner-Bocken Company
Business Acquisition [Line Items]
Useful Life in Years	10 years
Customer relationships | Maximum | Farner-Bocken Company
Business Acquisition [Line Items]
Useful Life in Years	12 years
Non-competition agreements | Farner-Bocken Company
Business Acquisition [Line Items]
Fair Value in Millions	$ 0.1
Non-competition agreements | Minimum | Farner-Bocken Company
Business Acquisition [Line Items]
Useful Life in Years	4 years
Non-competition agreements | Maximum | Farner-Bocken Company
Business Acquisition [Line Items]
Useful Life in Years	6 years
Trade names | Farner-Bocken Company
Business Acquisition [Line Items]
Fair Value in Millions	$ 2.8
Trade names | Minimum
Business Acquisition [Line Items]
Useful Life in Years	1 year
Trade names | Maximum
Business Acquisition [Line Items]
Useful Life in Years	2 years