Debt - Instruments (Details) - USD ($)	Oct. 26, 2016	Sep. 30, 2016	Dec. 31, 2015
Term loans
Schedule Of Debt Instruments [Line Items]
Amount of term loan outstanding		$ 323,000,000	$ 333,200,000
Credit facility
Schedule Of Debt Instruments [Line Items]
Amount outstanding		796,000,000	416,000,000
Unused portion of facility		457,600,000	838,500,000
Letters of credit and bankers acceptance
Schedule Of Debt Instruments [Line Items]
Amount outstanding		5,100,000	5,500,000
Other uncommited credit lines
Schedule Of Debt Instruments [Line Items]
Letters of credit, outstanding amount		$ 156,800,000	$ 208,400,000
Subsequent Event | Addition to Term loan
Schedule Of Debt Instruments [Line Items]
Term loan	$ 520,000,000
Subsequent Event | Term loans
Schedule Of Debt Instruments [Line Items]
Term loan	840,000,000
Subsequent Event | Credit facility
Schedule Of Debt Instruments [Line Items]
Maximum additional borrowings available at the entity's request subject to satisfaction of certain conditions	$ 200,000,000