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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - BALANCE SHEET (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current assets:      
Cash and cash equivalents $ 74.9 $ 68.3  
Prepayments and other current assets 3.8 4.0  
Total current assets 152.7 136.3  
Investment in and advances to / from subsidiaries 96.6 140.8  
Total assets 935.6 1,031.5 $ 1,158.8
Current liabilities:      
Convertible debentures   18.1  
Total current liabilities 122.9 115.9  
Convertible debentures 81.1 75.7  
Other long-term liabilities 4.7 5.0  
Total liabilities 797.9 839.1  
Shareholders' equity (45.0) (6.9)  
Total liabilities and equity 935.6 1,031.5  
Reportable Legal Entities | APC      
Current assets:      
Cash and cash equivalents 43.2 42.4  
Prepayments and other current assets 0.8 3.3  
Total current assets 44.0 45.7  
Investment in and advances to / from subsidiaries 0.3 51.6  
Total assets 44.3 97.3  
Current liabilities:      
Accounts payable and accrued liabilities 3.6 3.4  
Derivative liability 3.2 1.2  
Convertible debentures   18.1  
Total current liabilities 6.8 22.7  
Convertible debentures 81.1 80.4  
Other long-term liabilities 1.4 1.1  
Total liabilities 89.3 104.2  
Shareholders' equity (45.0) (6.9)  
Total liabilities and equity $ 44.3 $ 97.3