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Debt - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Other Long Term Debt $ 12.4 $ 12.6
Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility Current Borrowing Capacity 300.0  
Line of Credit Facility Maximum Borrowing Capacity $ 400.0  
Line of Credit Facility, Covenant Terms The Credit Facility has certain financial and other covenants, with the key financial covenant requiring that the Company’s consolidated total debt to adjusted EBITDA ratio cannot exceed 3.50 to 1.  
Line of Credit Facility, Covenant Compliance As of March 31, 2019 and December 31, 2018, the Company’s total debt to adjusted EBITDA ratio was below 1.0 to 1, and the Company was also in compliance with all of its other covenants.  
Line of Credit Facility, Amount Outstanding $ 0.0 $ 24.0
Debt Instrument Maturity Date Description During the first quarter of 2019, the Credit Facility was amended and restated to extend the maturity date to July 15, 2020.