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Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Accrued capital expenditures	$ 16.1	$ 8.6	$ 6.2
Facility lease obligation, including reimbursements		0	0
Capitalized and deferred interest	1.9	0	0
Stock options due to Company	1.2	3.8
Facilities Building D and E
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Facility lease obligation, including reimbursements	$ 25.0

Amounts due from owners or affiliates of the reporting entity related to issuance of the entity's capital stock before cash payment is received (does not include amounts due from officers or directors). This element would also include the receivable for proceeds from the issuance of shares under employee stock option exercises which proceeds have not been received as of the reporting date due to the timing of the transaction date versus the settlement date.

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