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Principal Accounting Policies and Related Financial Information - Adjusted Cash Flows to Apply Adopted Guidance (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net income (loss) $ 280.4 $ 118.3 $ 131.2 $ 211.6 $ 184.8 $ 162.2 $ 205.0 $ 185.1 $ 741.5 $ 737.1 $ 551.5
Income (loss) from continuing operations $ 335.4 $ 134.5 $ 142.0 $ 226.8 $ 220.6 $ 171.9 $ 219.6 $ 193.2 838.7 805.3 579.8
Adjustments from income (loss) from continuing operations to cash provided (required) by operating activities of continuing operations:                      
Deferred income taxes                 (52.7) 10.6 33.9
Pension and other postretirement benefits                 12.5 10.5 19.3
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:                      
Inventories                 (182.3) (320.7) (54.4)
Net cash provided (required) by operating activities of continuing operations                 660.0 898.6 736.8
Combined Effect of Changes                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net income (loss)                   737.1 551.5
Income (loss) from continuing operations                   805.3 579.8
Adjustments from income (loss) from continuing operations to cash provided (required) by operating activities of continuing operations:                      
Deferred income taxes                   10.6 33.9
Pension and other postretirement benefits                   10.5 19.3
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:                      
Inventories                   (320.7) (54.4)
Net cash provided (required) by operating activities of continuing operations                   898.6 736.8
Previously Reported                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net income (loss)                 735.7 734.0 550.6
Income (loss) from continuing operations                 832.9 802.2 578.9
Adjustments from income (loss) from continuing operations to cash provided (required) by operating activities of continuing operations:                      
Deferred income taxes                 (54.3) 9.7 33.6
Pension and other postretirement benefits                 19.9 24.9 25.8
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:                      
Inventories                 (182.3) (331.1) (59.7)
Net cash provided (required) by operating activities of continuing operations                 660.0 898.6 736.8
Effect of Change                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net income (loss)                 5.8    
Income (loss) from continuing operations                 5.8    
Adjustments from income (loss) from continuing operations to cash provided (required) by operating activities of continuing operations:                      
Deferred income taxes                 1.6    
Pension and other postretirement benefits                 (7.4)    
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:                      
Inventories                 0.0    
Net cash provided (required) by operating activities of continuing operations                 $ 0.0    
Effect of Change | Combined Effect of Changes                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net income (loss)                   3.1 0.9
Income (loss) from continuing operations                   3.1 0.9
Adjustments from income (loss) from continuing operations to cash provided (required) by operating activities of continuing operations:                      
Deferred income taxes                   0.9 0.3
Pension and other postretirement benefits                   (14.4) (6.5)
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:                      
Inventories                   10.4 5.3
Net cash provided (required) by operating activities of continuing operations                   0.0 0.0
Effect of Change | Effect of FIFO Change                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net income (loss)                   (8.2) (4.2)
Income (loss) from continuing operations                   (8.2) (4.2)
Adjustments from income (loss) from continuing operations to cash provided (required) by operating activities of continuing operations:                      
Deferred income taxes                   (2.2) (1.1)
Pension and other postretirement benefits                   0.0 0.0
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:                      
Inventories                   10.4 5.3
Net cash provided (required) by operating activities of continuing operations                   0.0 0.0
Effect of Change | Effect of Pension Change                      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                      
Net income (loss)                   11.3 5.1
Income (loss) from continuing operations                   11.3 5.1
Adjustments from income (loss) from continuing operations to cash provided (required) by operating activities of continuing operations:                      
Deferred income taxes                   3.1 1.4
Pension and other postretirement benefits                   (14.4) (6.5)
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:                      
Inventories                   0.0 0.0
Net cash provided (required) by operating activities of continuing operations                   $ 0.0 $ 0.0