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Property and Equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Property Plant And Equipment [Abstract]    
Depreciation expense $ 9.1 $ 6.7
Non-cash increases property and equipment acquired under capital leases 0.4 0.5
Non-cash increase (decrease) to property and equipment purchases in accounts payable and accrued liabilities $ (1.5) $ 3.1