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Debt - Summary (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Debt    
Total $ 1,498.2 $ 1,596.3
Less: unamortized discount and debt issuance costs (6.4) (7.8)
Less: amounts due within one year and short-term borrowings (64.9) (64.9)
Total long-term debt 1,426.9 1,523.6
Unsecured revolving credit facility due September 30, 2021    
Debt    
Total 300.0 368.0
Unsecured term loan due from September 30, 2020 to September 30, 2021    
Debt    
Total 435.0 465.0
Senior unsecured notes due April 15, 2023    
Debt    
Total 500.0 500.0
Senior unsecured notes due November 15, 2036    
Debt    
Total 250.0 250.0
Other notes and revolving credit facilities    
Debt    
Total $ 13.2 $ 13.3