Credit Facility	12 Months Ended
Dec. 31, 2014
Debt Disclosure [Abstract]
Credit Facility	9. Credit Facility On April 18, 2014, the Company entered into a five-year senior unsecured revolving credit facility with a syndicate of lenders, including Wells Fargo Bank, National Association, as administrative agent. The credit facility became available to the Company on June 2, 2014 as a result of the satisfaction of customary conditions, including the consummation of the Separation. The credit facility is for an aggregate principal amount of up to $750 million with sub-facilities for standby letters of credit and swingline loans, each with a sublimit of $150 million and $50 million, respectively. The Company has the right, subject to certain conditions, to increase the aggregate principal amount of commitments under the credit facility by $250 million. Borrowings under the credit facility will bear interest at a base rate (as defined in the credit agreement) plus an applicable interest margin based on the Company’s capitalization ratio. The base rate is calculated as the highest of (a) the Federal Funds Rate, as published by the Federal Reserve Bank of New York, plus 1/2 of 1%, (b) the prime commercial lending rate of the administrative agent, as established from time to time at its principal U.S. office, and (c) the Daily One-Month LIBOR (as defined in the credit agreement) plus 1%. The Company also has the option for borrowings under the credit facility to bear interest based on LIBOR (as defined in the credit agreement). The credit facility is unsecured and guaranteed by the Company’s domestic subsidiaries. The credit agreement also provides for customary fees, including administrative agent fees, commitment fees, fees in respect of letters of credit and other fees. The annual commitment fee ranges from 25 to 35 basis points of the unused portion of the credit facility. The line of credit expires in April 2019, unless extended. The credit facility contains usual and customary affirmative and negative covenants for credit facilities of this type including financial covenants consisting of (a) a maximum capitalization ratio (as defined in the credit agreement) of 50% and (b) a minimum interest coverage ratio (as defined in the credit agreement) of no less than 3:1. As of December 31, 2014, the Company was in compliance with all covenants. As of December 31, 2014, the Company had no borrowings against its revolving credit facility and a $2 million letter of credit was issued under its revolving credit facility. The letter of credit was issued in conjunction with casualty insurance expiring May 30, 2015.

9. Credit Facility

On April 18, 2014, the Company entered into a five-year senior unsecured revolving credit facility with a syndicate of lenders, including Wells Fargo Bank, National Association, as administrative agent. The credit facility became available to the Company on June 2, 2014 as a result of the satisfaction of customary conditions, including the consummation of the Separation. The credit facility is for an aggregate principal amount of up to $750 million with sub-facilities for standby letters of credit and swingline loans, each with a sublimit of $150 million and $50 million, respectively. The Company has the right, subject to certain conditions, to increase the aggregate principal amount of commitments under the credit facility by $250 million. Borrowings under the credit facility will bear interest at a base rate (as defined in the credit agreement) plus an applicable interest margin based on the Company’s capitalization ratio. The base rate is calculated as the highest of (a) the Federal Funds Rate, as published by the Federal Reserve Bank of New York, plus 1/2 of 1%, (b) the prime commercial lending rate of the administrative agent, as established from time to time at its principal U.S. office, and (c) the Daily One-Month LIBOR (as defined in the credit agreement) plus 1%. The Company also has the option for borrowings under the credit facility to bear interest based on LIBOR (as defined in the credit agreement). The credit facility is unsecured and guaranteed by the Company’s domestic subsidiaries. The credit agreement also provides for customary fees, including administrative agent fees, commitment fees, fees in respect of letters of credit and other fees. The annual commitment fee ranges from 25 to 35 basis points of the unused portion of the credit facility. The line of credit expires in April 2019, unless extended.

The credit facility contains usual and customary affirmative and negative covenants for credit facilities of this type including financial covenants consisting of (a) a maximum capitalization ratio (as defined in the credit agreement) of 50% and (b) a minimum interest coverage ratio (as defined in the credit agreement) of no less than 3:1. As of December 31, 2014, the Company was in compliance with all covenants.

As of December 31, 2014, the Company had no borrowings against its revolving credit facility and a $2 million letter of credit was issued under its revolving credit facility. The letter of credit was issued in conjunction with casualty insurance expiring May 30, 2015.