Derivative Instruments (Tables)

3 Months Ended

Mar. 31, 2012

Derivative Instruments [Abstract]

Reconciliation of Interest rate swap fair value activity

	Quarter Ended
	March 31, 2012			March 31, 2011
(In millions)
Asset (liability) at beginning of period	$	(7.2	)	$	(21.3	)
Total realized/unrealized gains or losses:
Included in earnings		(2.3	)		(3.7	)
Increase (decrease) in fair value included in comprehensive income		2.1			3.4
Settlements		2.3			3.8
Asset (liability) at end of period	$	(5.1	)	$	(17.8	)