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Retirement Benefits - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Estimated contributions   $ 10.3  
Discount percent   50.00%  
Defined contribution plan maximum annual contribution per employee percent 2.00%    
Pension plan      
Defined Benefit Plan Disclosure [Line Items]      
UMWA obligation increase due to Cadillac plan excise tax   $ (59.4) $ (53.0)
Retirement benefits other than pension      
Defined Benefit Plan Disclosure [Line Items]      
UMWA obligation increase due to Cadillac plan excise tax   $ (39.2) 15.2
Energy debt(k) (l)      
Defined Benefit Plan Disclosure [Line Items]      
Required notice   95 days  
Private Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Unfunded commitments   $ 5.0  
Structured credit(h) (l)      
Defined Benefit Plan Disclosure [Line Items]      
Required notice   65 days  
Hedge fund of funds      
Defined Benefit Plan Disclosure [Line Items]      
Required notice   95 days  
U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation   $ 908.0 826.8
UMWA obligation increase due to Cadillac plan excise tax   (53.5) (29.5)
Non-U.S. Plans      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation   318.6 280.9
Estimated contributions   9.2  
UMWA obligation increase due to Cadillac plan excise tax   $ (5.9) $ (23.5)
UMWA Plans      
Defined Benefit Plan Disclosure [Line Items]      
Black lung health care cost trend rate   5.90% 6.50%
Black lung health care cost ultimate rate   5.00% 5.00%
UMWA obligation increase due to Cadillac plan excise tax   $ (27.4)  
UMWA Plans | Energy debt(k) (l)      
Defined Benefit Plan Disclosure [Line Items]      
Lockup provision   3 years  
Black Lung and Other Plans      
Defined Benefit Plan Disclosure [Line Items]      
Black lung health care cost ultimate rate   5.00%  
UMWA obligation increase due to Cadillac plan excise tax   $ (11.8)  
Nonqualified U.S. pension plan      
Defined Benefit Plan Disclosure [Line Items]      
Estimated contributions   $ 0.6  
Canada Plan      
Defined Benefit Plan Disclosure [Line Items]      
Black lung health care cost trend rate   5.90%  
Black lung health care cost ultimate rate   5.00%  
Brazil Plan      
Defined Benefit Plan Disclosure [Line Items]      
Black lung health care cost trend rate   3.80%  
UMWA Excise Tax      
Defined Benefit Plan Disclosure [Line Items]      
Excise tax percent   40.00%