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Revenue from Contracts with Customers - Contract Acquisition Costs and Cost to Fulfill Contracts (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Capitalized Contract Cost [Roll Forward]    
Beginning Balance $ 10.4 $ 10.1
Contract payments 1.5 3.2
Contract amortization (1.4) (2.8)
Ending Balance $ 10.5 $ 10.5