Fair Value Measurements Derivative Instruments and hedging Activities Disclosure (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 0	$ 0	$ 0	$ 3.9
Net Periodic Cash Settlements and Accrued Interest	44.3	42.8	87.7	85.0
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 0.1	$ (2.8)	$ 8.5	$ 18.5