Revenue - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 13.5	$ 46.9
Contract assets	81.6	81.6	$ 66.7
Contract liabilities	$ 90.3	$ 90.3	$ 103.0