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Workers' Compensation Expense (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Reimbursable liabilities   $ 19.4
Insurance receivable, current   0.8
Insurance receivable, noncurrent   $ 18.6
Workers' Compensation [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Surety bonds and letters of credit outstanding $ 146.2