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Operations and Significant Accounting Policies - Revenue - Assets Recognized From the Costs to Obtain a Contract with a Customer (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]      
Contract Assets [1] $ 30.9   $ 31.6
Contract Asset Non-Cash Amortization $ 1.3 $ 0.6  
[1] Contract Assets include payments made to customers as an incentive to execute or extend service agreements. The contract payments are being amortized over the term of the respective agreements as a reduction to revenue.