Debt - Senior Secured Credit Facility (Details) - Revolving Credit Facility	3 Months Ended	9 Months Ended
	Mar. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jul. 31, 2013 USD ($)
Old Credit Facility | Senior Secured Debt
Line of Credit Facility [Line Items]
Amount borrowed under credit facility			$ 750,000,000
Write off of unamortized debt issue costs	$ 5,200,000
Credit Agreement
Line of Credit Facility [Line Items]
Debt issuance costs	4,800,000
Unamortized debt issuance fees	2,500,000
Percentage of guarantor's first-tier foreign subsidiaries		65.00%
Individual new book value of real property		$ 10,000,000
Credit Agreement | Letter of Credit
Line of Credit Facility [Line Items]
Amount borrowed under credit facility	75,000,000
Credit Agreement | Swing Line Loan
Line of Credit Facility [Line Items]
Amount borrowed under credit facility	100,000,000
Old Credit Facility and New Credit Facility
Line of Credit Facility [Line Items]
Average daily balance of borrowings outstanding		7,800,000
New Credit Facility
Line of Credit Facility [Line Items]
Amount borrowed under credit facility	450,000,000
New Credit Facility | Letter of Credit
Line of Credit Facility [Line Items]
Line of credit, amount outstanding		$ 0
Minimum | Credit Agreement
Line of Credit Facility [Line Items]
Consolidated interest coverage ratio		2.25
Maximum | Credit Agreement
Line of Credit Facility [Line Items]
Additional borrowing capacity	$ 200,000,000
Consolidated interest coverage ratio		2.5
LIBOR | Credit Agreement
Line of Credit Facility [Line Items]
Effective rate during period		2.25%
LIBOR | Minimum | Credit Agreement
Line of Credit Facility [Line Items]
Variable rate basis spread		2.25%
LIBOR | Maximum | Credit Agreement
Line of Credit Facility [Line Items]
Variable rate basis spread		2.75%
Alternate Base Rate | Credit Agreement
Line of Credit Facility [Line Items]
Effective rate during period		1.25%
Alternate Base Rate | Minimum | Credit Agreement
Line of Credit Facility [Line Items]
Variable rate basis spread		1.25%
Alternate Base Rate | Maximum | Credit Agreement
Line of Credit Facility [Line Items]
Variable rate basis spread		1.75%