Guarantees and Indemnifications (Details) $ in Millions	Jun. 30, 2015 USD ($)
Guarantee Of Financial Obligations Of Npt [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	$ 25.0
Various Subsidiary Surety Bonds And Performance Guarantees Expiring Between 2015 And 2016 [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	33.8
Guarantee Of Rocky River Reality And Nusco Lease Payments For Real Estate And Vehicles Expiring 2019 Through 2024 [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	12.7
Guarantee To Purchaser Of Es Boulos Company And A Bonding Company Expiring In 2016 And 2020 [Member]
Guarantee Obligations [Line Items]
Guarantee Obligations Maximum Exposure	$ 42.1