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	Dec. 31, 2016
Related Party Transaction [Line Items]
Print procurement services	$ 0.5	$ 0.5	$ 0.9	$ 1.0
Insurance and risk management services	0.0	$ 0.1	0.0	$ 0.2
Arthur J.Gallagher Co [Member]
Related Party Transaction [Line Items]
Net amount receivable from related parties	$ 0.2		$ 0.2		$ 0.4