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Retirement Benefits - Narrative (Details)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
USD ($)
employee
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Projected Retirement Benefit Expense In Next 12 months   $ 88.0        
Defined Contribution Plan, Cost   $ 39.9 $ 35.5 $ 34.5    
Other Postretirement Benefits [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Discount rate [1]   3.80% 4.35%      
Curtailment loss   $ 0.0 $ 0.0 $ 0.0    
Employer contributions   0.0 0.0      
Projected Retirement Benefit Expense In Next 12 months   27.0        
Defined Contribution Plan, Cost   $ 1.0 $ 1.7      
Assumed increase in per capita cost of covered benefits in next 12 months   6.40%        
Assumed ultimate health care cost trend rate   4.50%        
Year that ultimate trend rate is reached   2038        
Expected long-term rate of return on assets   4.00% 4.00% 4.00%    
Fair value of plan assets   $ 0.1 $ 0.6 $ 0.7    
Pension Benefits [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Discount rate [1]   3.85% 4.45% 4.65%    
Curtailment loss   $ (0.4) $ 0.0 $ 0.0    
Employer contributions   49.3 143.4      
Projected Retirement Benefit Expense In Next 12 months   61.0        
Accumulated benefit obligation   $ 2,482.5 $ 2,810.5      
Expected long-term rate of return on assets   7.75% 7.75% 8.00%    
Actual return on plan assets   (4.80%) 16.90% 5.30% (1.20%) 6.50%
Fair value of plan assets   $ 1,772.2 $ 2,129.6 $ 1,894.6    
Defined Benefit Plan, Weighted Average Life Expectancy   17 years        
Pension Benefits [Member] | Global debt securities and cash [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Unfunded commitments   $ 41.0        
Pension Benefits [Member] | Private equity [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Unfunded commitments   84.0        
Fair value of plan assets   137.1 137.5      
Pension Benefits [Member] | Hedge funds [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Fair value of plan assets   258.3 307.4      
Pension Benefits [Member] | Real estate and other [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Unfunded commitments   51.0        
Fair value of plan assets   52.7 93.9      
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 [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Expected long-term rate of return on assets 7.60%          
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%      
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   $ 8.0        
Pension Benefits [Member] | U.S. [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Defined benefit plan, number of employees accruing benefit service | employee   1,600        
Defined Benefit Plan, Percent Of Employees accruing benefit service   10.00%        
Employer contributions   $ 40.0 $ 135.0 $ 115.0    
Estimated employer contributions in next 12 months   $ 145.0        
Percentage of total assets   90.00%        
Number of shares of equity securities issued by employer included in plan assets | shares   0.0 3.0      
Fair value of employer equity securities included in plan assets     $ 71.3      
Voluntary lump sum cash out [Member] | Pension Benefits [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Benefits paid     $ 22.0      
Small annuity buy out [Member] | Pension Benefits [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Benefits paid   $ 97.0        
Small annuity buy out [Member] | Pension Benefits [Member] | U.S. [Member]            
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]            
Number of participants | employee   3,700        
Percent of U.S. employees as participants   17.00%        
[1] Other postretirement benefits expense for 2016 was initially measured at a 4.50% discount rate. A portion of the obligation was remeasured using a 4.05% discount rate as of March 1, 2016, following a new CBA.