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Employee Retirement Plans (Multiemployer Pension Plans) (Details)
$ in Millions
6 Months Ended
Jun. 30, 2016
USD ($)
plan
Jun. 30, 2015
USD ($)
Jul. 02, 2010
USD ($)
Multiemployer Plans [Line Items]      
Number of underfunded plans | plan 2    
Withdrawal obligation $ 41.8   $ 98.6
Multiemployer plan contributions 5.8 $ 6.2  
Other Long-Term Liabilities [Member]      
Multiemployer Plans [Line Items]      
Withdrawal obligation 25.7    
Accrued Liabilities [Member]      
Multiemployer Plans [Line Items]      
Withdrawal obligation 10.6    
Unsecured Notes [Member]      
Multiemployer Plans [Line Items]      
Withdrawal obligation $ 5.5