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SCHEDULE I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY - STATEMENTS OF CASH FLOW (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash provided by operating activities:      
Net (loss) income $ (43.8) $ 37.2 $ (93.0)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Non-cash losses (earnings) from subsidiaries, net of taxes 3.0 (43.2) 54.8
Dividends received from subsidiaries 59.5 61.6 47.3
Unrealized foreign exchange loss (gain) 12.2 (22.0) 15.2
Change in fair value of derivative instruments 10.7 (5.5) (2.1)
Change in other operating balances      
Accounts receivable 8.2 18.8 (15.4)
Prepayments and other assets 3.9 8.7 0.4
Cash provided by operating activities 144.7 137.5 169.2
Cash used in investing activities:      
Deposit for acquisition   (2.6)  
Cash used in investing activities: (21.7) (17.0) (4.3)
Cash used in financing activities:      
Common share repurchases (2.5) (16.6) (0.2)
Repayment of convertible debentures (18.5) (88.1)  
Deferred financing costs   (5.1) (0.3)
Proceeds from convertible debenture issuance   92.2  
Cash used in financing activities: (110.8) (135.0) (178.9)
Net increase (decrease) in cash, restricted cash and cash equivalents 12.2 (14.5) (14.0)
Cash, restricted cash and cash equivalents at beginning of period 70.4 84.9 98.9
Cash, restricted cash and cash equivalents at end of period 82.6 70.4 84.9
Supplemental cash flow information      
Interest paid 37.6 41.3 72.0
Reportable Legal Entities | APC      
Cash provided by operating activities:      
Net (loss) income (43.8) 37.2 (93.0)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Non-cash losses (earnings) from subsidiaries, net of taxes 22.9 (43.2) 71.8
Dividends received from subsidiaries 68.5 39.0 67.9
Unrealized foreign exchange loss (gain) 4.3 (9.4) 4.0
Change in fair value of derivative instruments 1.8 (3.2)  
Amortization of debt discount and deferred financing costs 0.7 2.6  
Change in other operating balances      
Accounts receivable (9.0) 7.4 (1.1)
Prepayments and other assets 2.5 1.0 1.4
Accounts payable and accrued liabilities 1.4 0.8 0.5
Cash provided by operating activities 49.3 32.2 51.5
Cash used in investing activities:      
Advances to / from investments in subsidiaries (27.5) 2.4 (57.8)
Cash paid for acquisition   (13.6)  
Deposit for acquisition   (2.6)  
Cash used in investing activities: (27.5) (13.8) (57.8)
Cash used in financing activities:      
Common share repurchases (2.5) (16.6) (0.2)
Repayment of convertible debentures (18.5) (88.1)  
Deferred financing costs   (5.1)  
Proceeds from convertible debenture issuance   92.2  
Repayment of intercompany note   (0.2) (0.9)
Cash used in financing activities: (21.0) (17.8) (1.1)
Net increase (decrease) in cash, restricted cash and cash equivalents 0.8 0.6 (7.4)
Cash, restricted cash and cash equivalents at beginning of period 42.4 41.8 49.2
Cash, restricted cash and cash equivalents at end of period 43.2 42.4 41.8
Supplemental cash flow information      
Interest paid $ 5.2 $ 4.7 $ 6.2