Interest Expense, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income and Expenses [Abstract]
Contractual interest, net of interest rate swaps	$ 6.8	$ 2.2	$ 10.5	$ 4.3
Accretion of debt discount	10.7	10.5	21.7	20.9
Amortization of debt issuance costs	1.0	0.7	1.8	1.4
Capitalized interest	(1.9)	(1.6)	(3.8)	(3.2)
Interest expense, net of portion capitalized	16.6	11.8	30.2	23.4
Interest income	(0.2)	(0.7)	(0.4)	(2.2)
Interest expense, net	$ 16.4	$ 11.1	$ 29.8	$ 21.2