Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Chairman and Chief Executive Officer [Member]
Related Party Transaction, Due from (to) Related Party [Abstract]
Lease expense	$ 0.7	$ 0.7
Expenses incurred with related party	$ 0.8	0.8
O&G [Member]
Related Party Transaction, Due from (to) Related Party [Abstract]
Number of Company's shares of common stock held by related party joint venture partner (in shares)	500,000
Expenses incurred with related party	$ 1.1	2.0
Ownership percentage in joint venture	30.00%
Alliant Insurance Services, Inc. [Member]
Related Party Transaction, Due from (to) Related Party [Abstract]
Insurance expense	$ 2.0	$ 0.8
Owed to related party	$ 1.9		$ 7.5