Revisions to Prior Period Financial Statements - Statement of Cash Flows (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Net earnings (loss) $ 57.1 $ (3.3) $ (157.3) $ 30.7    
Depreciation, depletion and amortization     64.7 68.0    
Finance fee amortization     1.7 1.5    
Stock-based compensation     6.7 5.1    
Deferred income taxes(a)     (11.9) 6.5    
Unrealized foreign exchange gain     (25.2) (12.6)    
Other, net     (0.3) 4.0    
Increase (Decrease) in Receivables     102.3 139.2    
Increase (Decrease) in Inventories     (14.0) (38.0)    
Increase (Decrease) in Other Operating Assets     (6.7) 33.0    
Accounts payable and accrued expenses and other current liabilities     49.1 0.1    
Increase (Decrease) in Other Operating Liabilities     (4.3) (3.6)    
Net Cash Provided by (Used in) Operating Activities     210.4 233.9    
Capital expenditures     (39.0) (42.7)    
Payments for (Proceeds from) Other Investing Activities     0.2 (1.3)    
Net Cash Provided by (Used in) Investing Activities     17.9 (44.0)    
Proceeds from revolving credit facility borrowings     190.1 64.2    
Principal payments on revolving credit facility borrowings     (285.4) (165.2)    
Proceeds from issuance of long-term debt     70.6 22.2    
Repayments of Long-term Debt     (123.1) (21.7)    
Payments of Ordinary Dividends, Common Stock     (48.7) (49.5)    
Payments of Financing Costs     (0.1) (0.1)    
Shares withheld to satisfy employee tax obligations     (1.2) (0.7)    
Other, net     (0.9) (0.9)    
Net Cash Provided by (Used in) Financing Activities     (197.5) (151.7)    
Effect of exchange rate changes on cash and cash equivalents     1.8 (5.7)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect     32.6 32.5    
Cash and cash equivalents, beginning of the year 53.6 67.2 53.6 67.2 $ 21.0 $ 34.7
Less: cash and cash equivalents included in current assets held for sale (27.3) (27.4) (27.3) (27.4)    
Cash and cash equivalents of continuing operations, end of period $ 26.3 39.8 26.3 39.8    
Interest paid, net of amounts capitalized     30.6 32.5    
Income taxes paid, net of refunds     $ 29.5 (37.7)    
As Previously Reported            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Net earnings (loss)   1.7   29.3    
Depreciation, depletion and amortization       68.0    
Finance fee amortization       1.5    
Stock-based compensation       5.1    
Deferred income taxes(a)       6.6    
Unrealized foreign exchange gain       (12.6)    
Other, net       4.0    
Increase (Decrease) in Receivables       139.2    
Increase (Decrease) in Inventories       (35.4)    
Increase (Decrease) in Other Operating Assets       33.7    
Accounts payable and accrued expenses and other current liabilities       (1.5)    
Increase (Decrease) in Other Operating Liabilities       (4.0)    
Net Cash Provided by (Used in) Operating Activities       233.9    
Capital expenditures       (42.7)    
Payments for (Proceeds from) Other Investing Activities       (1.3)    
Net Cash Provided by (Used in) Investing Activities       (44.0)    
Proceeds from revolving credit facility borrowings       64.2    
Principal payments on revolving credit facility borrowings       (165.2)    
Proceeds from issuance of long-term debt       22.2    
Repayments of Long-term Debt       (21.7)    
Payments of Ordinary Dividends, Common Stock       (49.5)    
Payments of Financing Costs       (0.1)    
Shares withheld to satisfy employee tax obligations       (0.7)    
Other, net       (0.9)    
Net Cash Provided by (Used in) Financing Activities       (151.7)    
Effect of exchange rate changes on cash and cash equivalents       (5.7)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect       32.5    
Cash and cash equivalents, beginning of the year   67.2   67.2   $ 34.7
Less: cash and cash equivalents included in current assets held for sale   0.0   0.0    
Cash and cash equivalents of continuing operations, end of period   67.2   67.2    
Interest paid, net of amounts capitalized       32.5    
Income taxes paid, net of refunds       (37.7)    
As Revised | Inventory Valuation Methodology Understatement And Other Immaterial Adjustments            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Net earnings (loss)   $ (3.3)   30.7    
Adjustment | Correction of SOP Inventory            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Increase (Decrease) in Inventories       (1.5)    
Increase (Decrease) in Other Operating Assets       (0.4)    
Adjustment | Inventory Valuation Methodology Understatement And Other Immaterial Adjustments            
Error Corrections and Prior Period Adjustments Restatement [Line Items]            
Increase (Decrease) in Inventories       4.1    
Increase (Decrease) in Other Operating Assets       $ (0.3)