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Debt - Other (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 12, 2013
USD ($)
Sep. 30, 2016
USD ($)
Nov. 30, 2006
USD ($)
tranche
Sep. 30, 2019
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 15, 2016
USD ($)
Debt              
Total         $ 1,596.3 $ 2,214.2  
Aggregate maturities of long-term debt for each of the next five years and thereafter              
2020         64.9    
2021         773.7    
2022         0.3    
2023         506.0    
2024         0.3    
Thereafter         251.1    
Credit Agreement              
Debt              
Maximum borrowing capacity   $ 2,100.0          
Debt term   5 years          
Unsecured revolving credit facility due September 30, 2021              
Debt              
Maximum borrowing capacity   $ 1,500.0          
Total         $ 368.0 $ 925.0  
Additional maximum borrowing capacity under the credit agreement subject to approval of the lenders and certain other conditions   500.0          
Commitment fee on unused portion of revolving credit facility (as a percent)         0.125%    
Weighted average fixed interest rate (as a percent)         3.69% 3.86%  
Letters of credit outstanding         $ 37.5    
Available on the revolving credit facility         1,090.0    
Unsecured term loan due from March 31, 2020 to September 30, 2021              
Debt              
Maximum borrowing capacity   $ 600.0          
Total         $ 465.0 $ 525.0  
Annual amortization of term loan thereafter until June 2021 (as a percent)   10.00%          
Interest rate added to base rate adjustment (as a percent)       (0.25%)      
Weighted average fixed interest rate (as a percent)         2.80% 3.77%  
Borrowings under the Credit Agreement due September 30, 2021 | LIBOR              
Debt              
Variable interest rate         LIBOR    
Interest rate added to base (as a percent)         1.00%    
Borrowings under the Credit Agreement due September 30, 2021 | Bank prime rate              
Debt              
Variable interest rate         bank prime rate    
Senior Unsecured Notes              
Debt              
Percentage of principal amount at which the notes may be required to be repurchased in event of a change of control and a downgrade of the entity's credit rating         101.00%    
Senior unsecured notes issued November 20, 2006              
Debt              
Issuance of debt     $ 600.0        
Number of tranches comprising the debt issuance | tranche     2        
Senior unsecured notes due November 15, 2016              
Debt              
Total             $ 0.0
Interest rate (as a percent)     6.20%        
Lump sum payment on maturity             $ 350.0
Issuance of debt     $ 350.0        
Senior unsecured notes due April 15, 2023              
Debt              
Total         $ 500.0 $ 500.0  
Interest rate (as a percent) 4.50%            
Issuance of debt $ 500.0            
Senior unsecured notes due November 15, 2036              
Debt              
Total         250.0 250.0  
Interest rate (as a percent)     6.85%        
Issuance of debt     $ 250.0        
Other notes and revolving credit facilities              
Debt              
Maximum borrowing capacity         9.9    
Other notes and revolving credit facilities | Asia              
Debt              
Lines of credit         4.3 4.7  
IRB              
Debt              
Total         $ 9.0 $ 9.5