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Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2012 | Mar. 31, 2011
Operating Activities [Abstract] |  |
Net Income | $ 24.4 | $ 37.1
Allowance for Funds Used During Construction | (0.8) | (0.6)
Income from Equity Investments, Net of Dividends | (0.7) | 0
Gain on Sale of Assets | 0 | (0.7)
Depreciation Expense | 24.6 | 22.3
Amortization of Debt Issuance Costs | 0.2 | 0.2
Deferred Income Tax Expense | 8.3 | 8.1
Share-Based Compensation Expense | 0.7 | 0.6
ESOP Compensation Expense | 1.8 | 1.9
Defined Benefit Pension and Other Postretirement Benefit Expense | 6.9 | 6.2
Bad Debt Expense | 0.3 | 0.2
Changes in Operating Assets and Liabilities [Abstract] |  |
Accounts Receivable | 2.7 | 7.8
Inventories | (3.1) | 3.9
Prepayments and Other | 4.2 | 4.1
Accounts Payable | (7.9) | (12.7)
Other Current Liabilities | (0.9) | 0.2
Cash Contributions to Defined Benefit Pension and Other Postretirement Benefit Plans | 0 | (10.9)
Changes in Regulatory and Other Non-Current Assets | 2.1 | (2.5)
Changes in Regulatory and Other Non-Current Liabilities | 5.7 | 3.9
Cash from Operating Activities | 68.5 | 69.1
Investing Activities [Abstract] |  |
Proceeds from Sale of Available-for-sale Securities | 0.5 | 7.0
Payments for Purchase of Available-for-sale Securities | (0.8) | (0.9)
Investment in ATC | (0.8) | (0.8)
Changes to Other Investments | (1.5) | (0.9)
Additions to Property, Plant and Equipment | (53.9) | (51.5)
Proceeds from Sale of Assets | 0 | 1.4
Cash for Investing Activities | (56.5) | (45.7)
Financing Activities [Abstract] |  |
Proceeds from Issuance of Common Stock | 23.7 | 2.1
Changes in Notes Payable | 0.5 | (0.5)
Reductions of Long-term Debt | (1.4) | (1.0)
Dividends on Common Stock | (17.7) | (16.2)
Cash from (for) Financing Activities | 5.1 | (15.6)
Change in Cash and Cash Equivalents | 17.1 | 7.8
Cash and Cash Equivalents at Beginning of Period | 101.1 | 44.9
Cash and Cash Equivalents at End of Period | $ 118.2 | $ 52.7

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- Definition Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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X
- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 + Details
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration