Debt (Tables)

6 Months Ended

Jun. 30, 2014

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

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

Description	Maturity Date	June 30, 2014			December 31, 2013
Senior secured credit facility	October 29, 2018	$	398.4		$	53.0
4.875% senior notes	March 15, 2023	400.0			400.0
2011 4.0% senior convertible notes	June 15, 2014	—			103.8
2011 4.25% senior convertible notes	December 15, 2014	95.7			94.5
2009 4.0% senior convertible notes	June 15, 2014	—			9.6
2009 4.25% senior convertible notes	December 15, 2014	3.0			3.0
Other credit facilities	Varies	46.8			—
Capital lease obligations, weighted average interest rate of 2.9%	In installments through June 13, 2021	169.2			126.0
Notes payable, equipment, weighted average interest rate of 3.2%	In installments through May 1, 2018	52.5			26.9
Total debt		$	1,165.6		$	816.8
Less current maturities		(76.9		)	(51.4		)
Long-term debt		$	1,088.7		$	765.4

Schedule of Interest Expense, Net

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

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2014			2013			2014			2013
Interest expense:
Contractual and other interest expense	$	10.6		$	9.6		$	20.4		$	17.5
Accretion of senior convertible note discount	1.4			1.3			2.8			2.6
Amortization of deferred financing costs	0.9			1.0			1.9			2.0
Total interest expense	$	12.9		$	11.9		$	25.1		$	22.1
Interest income	(0.0		)	(0.1		)	(0.1		)	(0.2		)
Interest expense, net	$	12.9		$	11.8		$	25.0		$	21.9