Subsequent Events (Details) - Subsequent Event [Member] $ in Millions	Jan. 25, 2016 USD ($) entity
Subsequent Event [Line Items]
Debt term	5 years
Revolving credit facility agreement	$ 600
Revolving credit facility agreement, number of participating banks | entity	9
Change in borrowing capacity	$ 350
Credit facility, Increased availability	100
Credit facility, Change in increased availability	25
Standby Letters of Credit [Member]
Subsequent Event [Line Items]
Line of credit sub-facility for issuing standby letters of credit	$ 80
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Subsequent Event [Line Items]
Interest rate over LIBOR on the facility	0.75%
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Subsequent Event [Line Items]
Interest rate over LIBOR on the facility	1.75%
London Interbank Offered Rate (LIBOR) [Member] | Standby Letters of Credit [Member] | Minimum [Member]
Subsequent Event [Line Items]
Interest rate over LIBOR on the facility	0.875%
London Interbank Offered Rate (LIBOR) [Member] | Standby Letters of Credit [Member] | Maximum [Member]
Subsequent Event [Line Items]
Interest rate over LIBOR on the facility	1.875%