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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Feb. 28, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Less: unamortized debt issuance costs $ (37.7)   $ (44.2)
Less: unamortized debt discount (13.0)   (3.7)
Total debt 3,337.8   3,362.7
Less: current portion of debt (23.0)   (43.4)
Debt, excluding current portion $ 3,314.8   $ 3,319.3
3.50% Senior Secured Notes      
Debt Instrument [Line Items]      
Less: unamortized debt issuance costs   $ (6.8)