Revenue - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue contract liability	$ 30.6			$ 30.2
Exptected timing to recognize deferred revenue	The Company expects to recognize substantially all of these amounts in revenues within approximately 12 months.
Revenue recognized from deferred	$ 26.6
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Threshold period past due when Company ceases billing and accruing late fees	30 days
Capitalized contract cost amortization period	5 years
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Threshold period past due when Company ceases billing and accruing late fees	40 days
Capitalized contract cost amortization period	10 years
Sales Revenue, Net | Contracts with Customers
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Concentration risk, percentage	80.00%
Prepaid Expenses
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized contract cost	$ 12.7
Other Assets
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized contract cost	34.5
Selling Expense
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized contract cost amortization	12.0
Processing Expense
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of equipment sales	$ 83.9	$ 96.9	$ 91.6