Debt (Tables)

6 Months Ended

Jun. 30, 2013

Debt Instrument [Line Items]

Schedule of Long Term Debt Instruments

The following table provides details of the carrying value of debt as of the dates indicated (in millions):

Description	Maturity Date	June 30, 2013			December 31, 2012
Credit facility	August 22, 2016	$	70.6		$	134.0
4.875% senior notes	March 15, 2023	400.0			—
7.625% senior notes	February 1, 2017	—			150.0
New 4.0% Notes, $105.3 million principal amount	June 15, 2014	102.3			100.9
New 4.25% Notes, $97.0 million principal amount	December 15, 2014	93.3			92.1
Original 4.0% Notes	June 15, 2014	9.6			9.7
Original 4.25% Notes	December 15, 2014	3.0			3.0
Capital lease obligations, weighted average interest rate of 2.7%	In installments through March 2020	118.4			79.0
Notes payable for equipment and other debt, weighted average interest rate of 3.1%	In installments through May 2018	59.2			30.2
Total debt		$	856.4		$	598.9
Less current maturities		(49.9		)	(52.6		)
Long-term debt		$	806.5		$	546.3

Schedule of Interest Expense, Net

The following table provides details of interest expense, net, classified within continuing operations for the periods indicated (in millions):

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2013			2012			2013			2012
Interest expense:
Contractual and other interest expense	$	9.2		$	7.1		$	16.8		$	13.5
Accretion of senior convertible note discount	1.3			1.2			2.6			2.4
Amortization of deferred financing costs and commitment fees	1.4			1.3			2.7			2.7
Total interest expense	$	11.9		$	9.6		$	22.1		$	18.6
Interest income	(0.1		)	(0.1		)	(0.2		)	(0.2		)
Interest expense, net	$	11.8		$	9.5		$	21.9		$	18.4

Total New Senior Convertible Notes [Member]

Debt Instrument [Line Items]

Schedule of Convertible Notes, Carrying Amount Details

The carrying values of the debt and equity components of the New Convertible Notes as of the dates indicated are as follows (in millions):

	June 30, 2013						December 31, 2012
	New 4.0% Senior Convertible Notes			New 4.25% Senior Convertible Notes			New 4.0% Senior Convertible Notes			New 4.25% Senior Convertible Notes
Principal amount	$	105.3		$	97.0		$	105.3		$	97.0
Unamortized debt discount and financing costs	(3.0		)	(3.7		)	(4.4		)	(4.9		)
Net carrying amount of debt component	$	102.3		$	93.3		$	100.9		$	92.1
Carrying amount of equity component	$	8.9		$	8.5		$	8.9		$	8.5

See Note 2 - Earnings Per Share for details regarding the value of the premium over the principal amount of the New Convertible Notes.