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Debt and Credit Facilities - Short-term Borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]    
Used lines of credit $ 166.4 $ 98.9
Unused lines of credit 1,231.9 1,245.2
Total available lines of credit 1,398.3 $ 1,344.1
Committed Line of Credit Facilities    
Line of Credit Facility [Line Items]    
Total available lines of credit $ 1,124.6