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Debt - Revolving Credit Facilities (Details)
$ in Millions
Sep. 30, 2019
USD ($)
Line of Credit Facility [Line Items]  
Total Commitments $ 1,683.7
Total Outstanding 187.1
Total Available 1,479.1
Standby letters of credit issued 17.5
Senior Secured Domestic Revolving Credit Facility  
Line of Credit Facility [Line Items]  
Total Commitments 1,450.0
Total Outstanding 88.0
Total Available 1,344.5
Senior Secured International Revolving Credit Facility  
Line of Credit Facility [Line Items]  
Total Commitments 173.6
Total Outstanding 80.1
Total Available 93.5
Other International Facilities  
Line of Credit Facility [Line Items]  
Total Commitments 60.1
Total Outstanding 19.0
Total Available $ 41.1