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Employee Retirement Plans (Multiemployer Pension Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Adjustment to MEPPs withdrawal liability $ 44.6 $ 18.4 $ 31.6
Multiemployer plans, plan contributions 13.1 24.0 11.8
Withdrawal liability 50.9    
Other Noncurrent Liabilities      
Defined Benefit Plan Disclosure [Line Items]      
Withdrawal liability 42.5 19.4  
Accrued Liabilities      
Defined Benefit Plan Disclosure [Line Items]      
Withdrawal liability $ 8.4 $ 8.8  
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]      
Adjustment to MEPPs withdrawal liability $ 32.1   $ 11.2