Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments in Balance Sheet (Details) (Derivatives Designated As Hedging Instruments [Member], Interest Rate Swaps [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Long-Term Liabilities [Member]
Liability Derivatives [Abstract]
Fair value of derivative liability	$ (5.3)	$ (8.4)
Accrued Liabilities [Member]
Liability Derivatives [Abstract]
Fair value of derivative liability	$ (0.5)	$ 0