Debt - Schedule of Weighted Average Interest Rates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument
Interest expense	$ 43.8	$ 29.5	$ 17.6
NSM
Debt Instrument
Weighted Average	276.0	274.2
Interest expense	$ 22.6	$ 22.0
Weighted Average Interest rate	8.20%	8.00%
NSM | Other Debt
Debt Instrument
Interest expense	$ 0.7	$ 0.1
NSM | Designated as Hedging Instrument
Debt Instrument
Weighted Average	146.9	148.4
Interest expense	$ 13.2	$ 13.4
Weighted Average Interest rate	9.00%	9.00%
NSM | Not Designated as Hedging Instrument
Debt Instrument
Weighted Average	$ 129.1	$ 125.8
Interest expense	$ 9.4	$ 8.6
Weighted Average Interest rate	7.30%	6.80%