Debt and Financing Arrangements Long-term Debt Instruments (Details) - USD ($) $ in Millions	Apr. 15, 2016	Jan. 22, 2016
Debt Instrument [Line Items]
Long-term debt, face amount		$ 1,000
6.4% Senior Unsecured Notes due 2016 [Member]
Debt Instrument [Line Items]
Long-term debt retired	$ 200
Long-term debt, interest rate	6.40%
7.85% Senior Unsecured Notes Due 2026 [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate		7.85%
Additional Interest Rate Accrued For Default Of Registration Rights Agreements First Period		0.25%
Additional Interest Rate Accrued For Default Of Registration Rights Agreements Each Subsequent Period		0.25%
Maximum Additional Interest Rate Accrued For Default Of Registration Rights Agreements All Periods		0.50%