Debt (Tables)

9 Months Ended

Sep. 30, 2013

Long-term Debt, Unclassified [Abstract]

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	September 30, 2013			December 31, 2012
Credit facility	August 22, 2016	$	36.4		$	134.0
4.875% senior notes	March 15, 2023	400.0			—
7.625% senior notes	February 1, 2017	—			150.0
2011 4.0% senior convertible notes	June 15, 2014	103.1			100.9
2011 4.25% senior convertible notes	December 15, 2014	93.9			92.1
2009 4.0% senior convertible notes	June 15, 2014	9.6			9.7
2009 4.25% senior convertible notes	December 15, 2014	3.0			3.0
Capital lease obligations, weighted average interest rate of 2.8%	In installments through March 2020	133.3			79.0
Notes payable for equipment and other debt, weighted average interest rate of 3.5%	In installments through May 2018	53.9			30.2
Total debt		$	833.2		$	598.9
Less current maturities		(53.3		)	(52.6		)
Long-term debt		$	779.9		$	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 September 30,					For the Nine Months Ended September 30,
	2013		2012			2013			2012
Interest expense:
Contractual and other interest expense	$	10.4	$	7.4		$	27.9		$	21.8
Accretion of senior convertible note discount	1.3		1.2			3.9			3.7
Amortization of deferred financing costs	1.0		0.9			3.0			2.7
Total interest expense	$	12.7	$	9.5		$	34.8		$	28.2
Interest income	—		(0.1		)	(0.3		)	(0.3		)
Interest expense, net	$	12.7	$	9.4		$	34.5		$	27.9