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Equity (Tables) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated Other Comprehensive Loss, net of tax, is summarized by component as follows:
December 31, 2020December 31, 2019
Interest swaps$(0.9)$(0.6)
Pension(1)
(112.0)(53.1)
SERP/ Retiree medical14.5 17.1 
Foreign currency impact on long term intercompany loan(11.8)(13.1)
Currency translation adjustment(43.9)(59.5)
Total accumulated other comprehensive loss$(154.1)$(109.2)
    
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax $ (9.5) $ (3.7) $ 0.3
Accumulated Other Comprehensive Income (Loss) $ (154.1) (109.2)  
Schedule Of Earnings Per Share, Basic And Diluted
Earnings per Share Calculation
Basic net income per share is computed using the weighted-average number of outstanding shares of Common Stock during the measurement period. Diluted net income per share is computed using the weighted-average number of outstanding shares of Common Stock and, when dilutive, potential outstanding shares of Common Stock during the measurement period.
The following table sets forth the computation of basic and diluted earnings per share:
 For the Twelve Months Ended
 December 31, 2020December 31, 2019December 31, 2018
 IncomeSharesPer
Share
Amount		IncomeSharesPer
Share
Amount		LossSharesPer
Share
Amount
Basic EPS        
(Loss) income available to common shareholders$(870.3)103.9 $(8.38)$529.7 103.6 $5.11 $616.5 108.0 $5.71 
Income allocated to participating securities— — 0.4 0.1  0.5 0.1  
Net (loss) income $(870.3)  $530.1   $617.0   
Diluted potential common shares 1.0   1.0  
Diluted EPS         
Net (loss) income $(870.3)103.9 $(8.38)$530.1 104.7 $5.06 $617.0 109.1 $5.65 
Included in the outstanding common shares were 1.5 million, 1.4 million and 1.4 million of issued but unvested shares at December 31, 2020, 2019 and 2018, respectively, which are excluded from the basic EPS calculation. 		   
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss) $ (112.0) (53.1)  
Accumulated SERP And Retiree Medical [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss) 14.5 17.1  
Foreign Currency Impact On Long Term Intercompany Loan [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss) (11.8) (13.1)  
Accumulated Translation Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss) (43.9) (59.5)  
Accumulated Interest Rate Swaps      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Accumulated Other Comprehensive Income (Loss) $ (0.9) $ (0.6)