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Revenue Recognition - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Accumulated deficit	$ (2,336.8)	$ (2,225.7)
Accounting Standards Update 2014-09
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Revenue recognized from deferred revenue	14.8
Contract asset reclassified to receivables	$ 2.7
Revenue, practical expedient, incremental cost of obtaining contract	true
Revenue, remaining performance obligation, optional exemption, performance obligation	true
Cumulative Impact of Adopting Topic 606 \| Accounting Standards Update 2014-09
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Accumulated deficit			$ 12.9