Detail of Certain Balance Sheet Accounts  | 
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| Balance Sheet Related Disclosures [Abstract] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Details of Certain Balance Sheet Accounts | 
 13. Detail of Certain Balance Sheet Accounts Other Assets The Other assets on the Company’s accompanying condensed consolidated balance sheets includes deferred compensation plan assets of $32.0 million and $30.6 million and long-term deferred tax assets of $186.1 million and $155.2 million as of June 30, 2017 and December 31, 2016, respectively. Other Current Liabilities Other current liabilities consist of the following: 
 
 
 Other Non-Current Liabilities The Other non-current liabilities on the Company’s accompanying condensed consolidated balance sheets includes deferred compensation plan liabilities of $53.8 million and $50.0 million and deferred income tax liabilities of $15.5 million and $15.3 million as of June 30, 2017 and December 31, 2016, respectively. See Note 6, Employee Compensation Plans, to the consolidated financial statements in the 2016 10-K for a further description of the Company’s deferred compensation plan assets and liabilities.  | 
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