Related Party Transactions - Narrative (Details) - Arthur J.Gallagher & Co - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Print services	$ 1.7	$ 1.7	$ 0.7
Insurance and risk management services	0.6	$ 0.6	$ 0.5
Related party receivable	$ 0.2