Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Polsinelli
Related Party Transaction [Line Items]
Legal services obtained	$ 0.2	$ 0.3	$ 0.6	$ 0.6
Accounts payable for legal services	0.3	$ 0.1	0.3	$ 0.1
Family member of the Company's Executive Vice President | Legal services from Segal McCambridge Singer & Mahone
Related Party Transaction [Line Items]
Legal services obtained	$ 0.1		$ 0.3