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Litigation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 19, 2017
Dec. 31, 2017
Litigation    
Cash paid for settlement of loss contingency   $ 210.0
U.S Department of Justice    
Litigation    
Cash paid for settlement of loss contingency $ 210.0  
Loss contingency accrual   $ 210.0
Office of Inspector General    
Litigation    
Period for maintaining corporate compliance program and to undertake defined corporate integrity obligations 5 years