Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2011

Comprehensive Income [Abstract]

After-tax components of comprehensive income

	Three Months Ended June 30,						Six Months Ended June 30,
	2011			2010			2011		2010
	(Dollars in millions)
Net income	$	292.2		$	214.2		$	470.9	$	350.9
Net increase (decrease) in fair value of cash flow hedges, net of income taxes		64.3			(187.2	)		96.8		(132.2	)
Net unrealized (losses) gains on available-for-sale securities, net of income taxes		(0.8	)		—			0.2		—
Amortization of actuarial loss and prior service cost associated with postretirement plans and workers’ compensation obligations, net of income taxes		10.0			8.5			23.5		16.0
Comprehensive income	$	365.7		$	35.5		$	591.4	$	234.7