Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2011

Derivative Instruments [Abstract]

Reconciliation of Interest rate swap fair value activity

	Quarter Ended						Six Months Ended
	June 30,			June 30,			June 30,			June 30,
	2011			2010			2011			2010
(In millions)
Asset (liability) at beginning of period	$	(17.8	)	$	(28.6	)	$	(21.3	)	$	(28.7	)
Total realized/unrealized gains or losses:
Included in earnings		(3.9	)		(4.5	)		(7.6	)		(9.0	)
Increase (decrease) in fair value included in comprehensive income		3.1			1.0			6.5			1.1
Settlements		3.8			4.6			7.6			9.1
Asset (liability) at end of period	$	(14.8	)	$	(27.5	)	$	(14.8	)	$	(27.5	)