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Interest Expense, Net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Other Income and Expenses [Abstract]        
Cash interest, net of interest rate swaps $ 8.4 $ 2.1 $ 18.9 $ 6.4
Accretion of debt discount 7.5 10.6 29.2 31.5
Amortization of debt issuance costs 0.9 0.7 2.7 2.1
Capitalized interest (0.4) (1.5) (4.2) (4.7)
Interest expense, net of portion capitalized 16.4 11.9 46.6 35.3
Interest income (0.1) (0.5) (0.5) (2.7)
Interest expense, net $ 16.3 $ 11.4 $ 46.1 $ 32.6