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Debt and Credit Facilities - Short-term Borrowings (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]    
Used lines of credit $ 251.7 $ 232.8
Unused lines of credit 1,101.4 1,135.3
Total available lines of credit 1,353.1 $ 1,368.1
Committed Line Of Credit Facilities    
Line of Credit Facility [Line Items]    
Total available lines of credit $ 1,136.6