Debt - Schedule of Debt Instrument Redemption (Details) - Senior Notes [Member]	Sep. 30, 2015 USD ($)
Debt Instrument [Line Items]
Face amount of debt instrument	$ 500,000,000
Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Face amount of debt instrument	$ 250,000,000
Stated interest rate	4.40%
Percentage of issuance price	99.883%
Senior Notes Due 2023 [Member]
Debt Instrument [Line Items]
Face amount of debt instrument	$ 250,000,000
Stated interest rate	4.25%
Percentage of issuance price	99.026%