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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating activities      
Net income $ 542.6 $ 492.3 $ 490.1
Adjustments to reconcile net income to cash provided by operating activities:      
Depreciation and amortization 798.3 748.1 707.0
Nuclear fuel amortization 119.0 121.9 114.4
Deferred income taxes (39.0) 41.3 193.2
Allowance for equity funds used during construction (24.8) (23.8) (29.5)
Provision for bad debts 13.0 16.2 15.7
Net realized and unrealized hedging and derivative transactions 18.5 27.0 (2.8)
Changes in operating assets and liabilities:      
Accounts receivable 15.0 (42.7) (29.8)
Accrued unbilled revenues 19.6 7.4 (18.1)
Inventories (28.7) (21.4) 7.6
Other current assets (3.3) 94.4 (25.3)
Accounts payable (12.5) 10.5 46.5
Net regulatory assets and liabilities (139.7) 182.3 (36.4)
Other current liabilities (11.7) (64.0) (71.8)
Pension and other employee benefit obligations (48.5) (75.8) (56.7)
Other, net (48.9) (31.5) (31.3)
Net cash provided by operating activities 1,168.9 1,482.2 1,272.8
Investing activities      
Utility capital/construction expenditures (1,416.9) (1,149.7) (987.2)
Purchases of investment securities (995.1) (852.9) (1,690.5)
Proceeds from the sale of investment securities 975.0 832.6 1,668.9
Investments in utility money pool arrangement (219.0) (805.0) (122.0)
Repayments from utility money pool arrangement 219.0 805.0 122.0
Other, net (3.1) (3.5) (3.5)
Net cash used in investing activities (1,440.1) (1,173.5) (1,012.3)
Financing activities      
(Repayments of) proceeds from short-term borrowings, net (120.0) 130.0 (65.0)
Borrowings under utility money pool arrangement 696.0 479.0 838.0
Repayments under utility money pool arrangement (696.0) (564.0) (753.0)
Proceeds from issuance of long-term debt 579.8 0.0 585.2
Repayments of long-term debt, including reacquisition premiums 0.0 0.0 (507.9)
Capital contributions from parent 354.3 108.8 145.0
Dividends paid to parent (466.6) (456.3) (506.6)
Net cash provided by (used in) financing activities 347.5 (302.5) (264.3)
Net change in cash, cash equivalents and restricted cash 76.3 6.2 (3.8)
Cash, cash equivalents and restricted cash at beginning of period 50.0 43.8 47.6
Cash, cash equivalents and restricted cash at end of period 126.3 50.0 43.8
Supplemental disclosure of cash flow information:      
Cash paid for interest (net of amounts capitalized) (208.9) (207.4) (214.2)
Cash (paid) received for income taxes, net 104.5 (89.0) 70.9
Supplemental disclosure of non-cash investing transactions:      
Accrued property, plant and equipment additions 94.5 92.5 93.1
Inventory transfers to plant, property and equipment 23.5 60.8 17.3
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 628.5 0.0 0.0
Allowances for equity funds used during construction $ 24.8 $ 23.8 $ 29.5