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Commitments (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Other Commitments [Line Items]  
Letters of Credit Outstanding, Amount $ 76.0
Revolving Credit Facility [Member]  
Other Commitments [Line Items]  
Letters of Credit Outstanding, Amount 46.3
Cash and Cash Equivalents [Member]  
Other Commitments [Line Items]  
Pledged Assets, Not Separately Reported, Other 3.7
Guarantee Type, Other [Member]  
Other Commitments [Line Items]  
Guarantor Obligations, Maximum Exposure, Undiscounted 12.6
Performance Guarantee [Member]  
Other Commitments [Line Items]  
Guarantor Obligations, Maximum Exposure, Undiscounted 41.6
Indemnification Agreement [Member]  
Other Commitments [Line Items]  
Guarantor Obligations, Maximum Exposure, Undiscounted $ 718.0