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Credit Facility and Long-Term Debt - Summary of Contractual Obligations Under Long-term Debts (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
Less than 1 year $ 0.0
1-3 years 250.0
3-5 years 0.0
More than 5 years 300.0
Total $ 550.0