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Employee Retirement Plans (Multiemployer Pension Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Other restructuring charges $ 4.4 $ 44.6 $ 18.4
Multiemployer plans, plan contributions 10.4 13.1 $ 24.0
Withdrawal liability 44.1    
Other Noncurrent Liabilities      
Defined Benefit Plan Disclosure [Line Items]      
Withdrawal liability 35.7 42.5  
Accrued Liabilities      
Defined Benefit Plan Disclosure [Line Items]      
Withdrawal liability $ 8.4 8.4  
Graphics Communications International Union Employer Retirement Fund      
Defined Benefit Plan Disclosure [Line Items]      
Funded percentage of plan (less than) 65.00%    
Graphics Communications Conference of the International Brotherhood of Teamsters National PensionFund      
Defined Benefit Plan Disclosure [Line Items]      
Funded percentage of plan (less than) 65.00%    
Adjustment to MEPPs withdrawal liability      
Defined Benefit Plan Disclosure [Line Items]      
Other restructuring charges $ 32.1 $ 32.1