Summary of Significant Accounting Policies (Details) - ASU 2016-02 - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jan. 01, 2016
Recent Accounting Pronouncements
Estimated increase in straight-line rental expense	$ 1.3	$ 1.2	$ 2.5	$ 2.4
Minimum
Recent Accounting Pronouncements
Right of use asset					$ 100.0
Right of use liability					100.0
Maximum
Recent Accounting Pronouncements
Right of use asset					300.0
Right of use liability					$ 300.0