Commitments (Details) $ in Millions	Jun. 30, 2016 USD ($)
Other Commitments [Line Items]
Letters of Credit Outstanding, Amount	$ 69.6
Revolving Credit Facility [Member]
Other Commitments [Line Items]
Letters of Credit Outstanding, Amount	45.3
Cash and Cash Equivalents [Member]
Other Commitments [Line Items]
Pledged Assets, Not Separately Reported, Other	3.3
Guarantee Type, Other [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	15.6
Performance Guarantee [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	24.1
Indemnification Agreement [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 458.0