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Accounts and Other Receivables (Initial Adoption of New Accounting Standard Unit) (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Accounting Standards Update [Extensible List] Accounting Standards Update 2014-09 us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate201602Member Accounting Standards Update 2014-09  
Trade receivables, net   $ 535.2 $ 564.4      
Other current assets     1,012.7      
Net property, plant and equipment   784.8 830.8 $ 728.5    
Total other assets     2,447.5      
TOTAL ASSETS   4,800.0 4,855.4 $ 3,447.6    
Total current liabilities   1,006.0 928.1      
Long-term liabilities   2,368.9 2,585.4      
Retained earnings   2,797.2 2,763.9      
Other equity     (1,422.0)      
TOTAL LIABILITIES AND EQUITY   $ 4,800.0 $ 4,855.4      
Adjustment            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Trade receivables, net           $ (3.3)
Other current assets           0.0
Net property, plant and equipment           0.0
Total other assets           0.0
TOTAL ASSETS           (3.3)
Total current liabilities           0.0
Long-term liabilities           (0.8)
Retained earnings           (2.5)
Other equity           0.0
TOTAL LIABILITIES AND EQUITY           (3.3)
Adjusted balance            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Trade receivables, net           561.1
Other current assets           1,012.7
Net property, plant and equipment           830.8
Total other assets           2,447.5
TOTAL ASSETS           4,852.1
Total current liabilities           928.1
Long-term liabilities           2,584.6
Retained earnings           2,761.4
Other equity           (1,422.0)
TOTAL LIABILITIES AND EQUITY           $ 4,852.1