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Retirement Benefits - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
USD ($)
employee
Dec. 31, 2020
USD ($)
employee
Dec. 31, 2019
USD ($)
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined contribution plan, deferred contributions due to COVID-19 pandemic     $ 7.3      
Projected Retirement Benefit Expense In Next 12 months   $ 37.0        
Defined Contribution Plan, Cost   $ 20.4 29.9 $ 44.8    
Termination benefits     17.4      
Multiemployer Plans, Withdrawal Obligation, Payment Period   20 years        
Income tax provision (benefit)   $ 26.8 77.7 (28.5)    
Settlement gain   (21.9) 0.0 0.0    
Reclassification out of Accumulated Other Comprehensive Income [Member] | Post- retirement benefit plans [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Income tax provision (benefit) [1]   (11.9) (19.7) (20.3)    
Settlement gain   21.9 [2] $ 0.0 $ 0.0    
Collective-Bargaining Arrangement, Other            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Income tax provision (benefit)   15.5        
Foreign Plan            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Plan assets pledged as collateral   $ 62.0        
Other Postretirement Benefits            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Discount rate   2.45% 3.25% 4.35%    
Curtailment loss (gain)   $ 0.0 $ (0.2) $ 0.0    
Employer contributions   0.0 0.0      
Projected Retirement Benefit Expense In Next 12 months   21.0        
Defined Contribution Plan, Cost   $ 0.0 $ 0.7 $ 1.0    
Assumed increase in per capita cost of covered benefits in next 12 months   6.50%        
Assumed ultimate health care cost trend rate   4.00%        
Expected long-term rate of return on assets   0.00% 0.00% 4.00%    
Fair value of plan assets   $ 0.0 $ 0.0 $ 0.1    
Termination benefits   0.0 6.7 $ 0.0    
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement   43.0 0.0      
Settlement gain   $ 21.9 $ 0.0      
Pension Benefits [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Discount rate   2.60% 3.40% 4.40%    
Curtailment loss (gain)   $ 0.0 $ 0.0 $ 0.0    
Employer contributions   77.3 138.8      
Projected Retirement Benefit Expense In Next 12 months   16.0        
Accumulated benefit obligation   $ 2,498.0 $ 2,703.9      
Expected long-term rate of return on assets   6.71% 7.16% 7.52%    
Actual return on plan assets   12.40% 15.20% 15.10% (4.80%) 16.90%
Fair value of plan assets   $ 2,120.9 $ 2,046.4 $ 1,902.1    
Defined Benefit Plan, Weighted Average Life Expectancy   17 years        
Termination benefits   $ 0.0 10.9 0.0    
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement   0.0 0.0      
Settlement gain   0.0 0.0      
Pension Benefits [Member] | Global debt securities and cash [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Unfunded commitments   62.0        
Pension Benefits [Member] | Private equity [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Unfunded commitments   97.0        
Fair value of plan assets   176.7 130.0      
Pension Benefits [Member] | Hedge funds [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Fair value of plan assets   292.1 325.0      
Pension Benefits [Member] | Real estate and other [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Unfunded commitments   44.0        
Fair value of plan assets   25.8 26.9      
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Fair value of plan assets   0.0 0.0      
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Private equity [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Fair value of plan assets   0.0 0.0      
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Hedge funds [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Fair value of plan assets   0.0 0.0      
Pension Benefits [Member] | Fair Value, Inputs, Level 3 [Member] | Real estate and other [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Fair value of plan assets   0.0 $ 0.0      
Pension Benefits [Member] | Forecast            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Expected long-term rate of return on assets 6.43%          
Pension Benefits [Member] | MultiemployerPlan1 [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Percent of Current Year Contributions to Plan that Company Contributions Exceed     5.00%      
Multiemployer Plans, Withdrawal Obligation   35.0        
Pension Benefits [Member] | Nonqualified and U.K. [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Estimated employer contributions in next 12 months   $ 10.0        
Pension Benefits [Member] | United States            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined benefit plan, number of employees accruing benefit service | employee   1,100        
Defined Benefit Plan, Percent Of Employees accruing benefit service   10.00%        
Percent reduction in defined benefit plan participation   60.00%        
Employer contributions   $ 67.0 $ 130.0 $ 145.0    
Voluntary employer contributions to pension plan   50.0        
Expected future voluntary contributions to pension plan   50.0        
Estimated employer contributions in next 12 months   $ 0.0        
Percentage of total assets   90.00%        
Small annuity buy out [Member] | Pension Benefits [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Benefits paid   $ 70.0 $ 86.0      
Small annuity buy out [Member] | Pension Benefits [Member] | United States            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Number of participants | employee   1,000 1,200      
Percent of U.S. employees as participants   7.00% 8.00%      
[1] These amounts exclude the impact of any deferred tax asset valuation allowances, when applicable, including recognition of stranded balances (see Note 17 for further explanation).
[2] Amounts are included in nonoperating retirement benefit expense (see Note 14).