Customer Leases (Tables)

12 Months Ended

Dec. 31, 2013

Leases [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

The future minimum lease payments to be received under non-cancelable operating leases, excluding month-to-month arrangements and submetered power, for the next five years are shown below:

(Dollars in millions)
2014	$	145.4
2015	98.7
2016	69.1
2017	44.3
2018	29.7

At December 31, 2013, future minimum lease payments required under operating leases having initial or remaining non-cancelable lease terms in excess of one year are as follows:

(Dollars in millions)
2014	$	4.4
2015	1.8
2016	0.7
2017	—
2018	—
Thereafter	1.0
Total	$	7.9