Revenue - Schedule of Contract Assets and Liabilities (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Contract assets	$ 43,500,000	$ 36,500,000
Contract liabilities	32,100,000	32,800,000
Net contract assets	11,400,000	$ 3,700,000
$ Change
Contract assets	7,000,000.0
Contract liabilities	(700,000)
Net contract assets	$ 7,700,000
% Change
Contract assets	19.20%
Contract liabilities	(2.10%)
Net contract assets	208.10%
Percent of contract liabilities	70.00%
Impairment losses on contract assets	$ 0