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Supplementary Financial Information - Schedule of Cash and Cash Equivalents (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Offsetting Assets [Line Items]      
Cash and cash equivalents $ 80.4 $ 45.5 $ 43.8
Restricted cash 0.3 2.0 1.5
Restricted cash - non-current 1.5 0.0 0.0
Total cash, cash equivalents and restricted cash 82.2 47.5 45.3
Cash paid for interest 42.5 32.6  
Cash paid for taxes, net of refunds 5.9 5.4  
Property, plant and equipment included in accounts payable 0.4 1.4  
Accrued interest and fees capitalized into principal debt 17.5 0.0  
Issuance of redeemable noncontrolling interest 0.0 40.9  
Extinguishment of convertible note in exchange 0.0 51.8  
Issuance of convertible note in exchange 0.0 (51.8)  
Debt assumed in acquisitions 0.0 6.3  
Preferred stock and fixed maturities      
Offsetting Assets [Line Items]      
Issuance of preferred stock 0.9 19.1  
Discontinued Operations      
Offsetting Assets [Line Items]      
Cash and cash equivalents classified in Assets held for sale, beginning of period $ 0.0 195.2  
Restricted cash classified in Assets held for sale   0.0 0.2
Total cash and cash equivalents and restricted cash classified in Assets held for sale   $ 0.0 $ 195.4