Revenue Recognition - Changes in Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accounts receivables current
Contract Receivables	$ 427.2	$ 507.0
Contract with customer assets current
Contract Assets (Current)	23.5	48.6
Contract with customer non-current asset
Contract Assets (Long-term)	6.8	24.9
Contract with customer liability current
Contract Liabilities (Current)	42.8	66.8
Contract with customer liability non-current
Contract Liabilities (Long-term)	$ 44.2	$ 70.5
Contract Asset Balance
Contract percentage recognized	64.00%
2021	22.00%
2022 or thereafter	14.00%