Revenue Recognition - Changes in Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Accounts receivables current
Contract Receivables	$ 647.2	$ 791.2
Contract with customer assets current
Contract Assets (Current)	38.1	55.8
Contract with customer non-current asset
Contract Assets (Long-term)	32.3	32.3
Contract with customer liability current
Contract Liabilities (Current)	72.0	116.7
Contract with customer liability non-current
Contract Liabilities (Long-term)	$ 67.6	$ 69.7
Contract Asset Balance
2019	60.00%
Contract percentage recognized	50.00%
2020	17.00%
2021 or thereafter	23.00%