Restructuring, Impairment and Other Charges - Other Charges - Narrative (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) Pension_Plan	Dec. 31, 2015 USD ($) Pension_Plan
Restructuring Cost And Reserve [Line Items]
Other Charges	$ 2.3	$ 2.3	$ 2.2
Accrued liabilities	447.5	541.7
Other noncurrent liabilities	180.2	$ 193.1
Courier Corporation
Restructuring Cost And Reserve [Line Items]
Number of multi-employer pension plans | Pension_Plan		2	2
Multi-employer pension plan withdrawal obligations
Restructuring Cost And Reserve [Line Items]
Other Charges		$ 2.3	$ 2.2
Accrued liabilities	5.1	4.9
Other noncurrent liabilities	$ 31.7	$ 34.8