Derivative Contracts Schedule of Interest Rate Contracts (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative, Maturity Date	Mar. 31, 2017
Derivative, Fixed Interest Rate	0.96%
First Term Loan Tranche [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	$ 300.0
Derivative, Fixed Interest Rate	1.07%
Derivative, Description of Terms	One-month LIBOR
Second Term Loan Tranche [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	300.0
Derivative, Fixed Interest Rate	0.86%
Derivative, Description of Terms	One-month LIBOR
Term Loan due 2017 [Member]
Derivative [Line Items]
Notional amount	$ 600.0