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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Jan. 01, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Accumulated deficit	$ (2,244.7)	$ (2,225.7)
Accounting Standards Update 2014-09
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue recognized from deferred revenue	14.0
Contract asset reclassified to receivables	$ 2.7
Cumulative Impact of Adopting Topic 606 \| Accounting Standards Update 2014-09
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Accumulated deficit			$ 12.9