Revenue Recognition - Contract Balances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Capitalized Contract Cost [Line Items]
Performance obligation, description of timing	generally 3 - 5 years
Contract with Customer, Asset and Liability [Abstract]
Total contract liabilities	$ 9.0		$ 8.4
Contract liabilities, revenue recognition period	36 months
Capitalized Contract Cost [Abstract]
Deferred sales commissions	$ 7.5
Minimum
Capitalized Contract Cost [Abstract]
Sales commissions capitalized, amortization period	4 years
Maximum
Capitalized Contract Cost [Abstract]
Sales commissions capitalized, amortization period	5 years
Accounting Standards Update 2014-09
Capitalized Contract Cost [Abstract]
Deferred sales commissions		$ 7.9