Revenues - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Contract with Customer, Liability	$ 37.5	$ 37.0
Contract with Customer, Liability, Noncurrent	17.6	16.5
Deferred Revenue, Revenue Recognized	14.0
Deferred Costs	23.4	13.2
Cost to Obtain
Segment Reporting Information [Line Items]
Deferred Costs	11.6
Capitalized Contract Cost, Amortization	1.4
Cost to Fulfill
Segment Reporting Information [Line Items]
Deferred Costs	68.0	$ 69.8
Capitalized Contract Cost, Amortization	$ 1.9