Related Party Transactions (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Arthur J. Gallagher & Co.
Related Party Transaction [Line Items]
Print procurement services	$ 1.8	$ 1.6	$ 1.9
Amount billed to the Company for consideration of services	0.3	0.1	0.1
Net amount receivable from related parties	0.2	0.3
Enova Inc.
Related Party Transaction [Line Items]
Print procurement services	16.1	10.1	$ 0.1
Net amount receivable from related parties	$ 4.6	$ 2.0