CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities
Net income	$ 106.9	$ 33.8
Amortization in interest expense	3.6	4.1
Compensation on equity grants	4.2	3.8
Depreciation and amortization expense	79.6	64.0
Accretion of asset retirement obligations	1.2	1.1
Deferred income tax expense	(1.4)	0.2
Equity earnings, net of distributions	0	(1.6)
Risk management activities	(0.3)	(0.2)
Gain on sale or disposition of assets	(0.8)	(0.1)
Changes in operating assets and liabilities:
Receivables and other assets	57.3	95.1
Inventory	60.6	33.7
Accounts payable and other liabilities	7.8	(41.0)
Net cash provided by operating activities	318.7	192.9
Cash flows from investing activities
Outlays for property, plant and equipment	(197.7)	(221.8)
Purchase of material and supplies	0.1	0
Return of capital from unconsolidated affiliate	2.2	0
Other, net	1.7	(4.6)
Net cash used in investing activities	(193.7)	(226.4)
Cash flows from financing activities, Partnership loan facilities:
Proceeds	460.0	325.0
Repayments	(500.0)	(380.0)
Partnership accounts receivable securitization facility:
Borrowings	29.5	171.4
Repayments	(75.7)	(60.0)
Non-Partnership loan facilities:
Proceeds	4.0	5.0
Repayments	(16.0)	(15.0)
Costs incurred in connection with financing arrangements	(1.2)	(3.2)
Distributions to owners	(81.7)	(61.7)
Proceeds from sale of common units of the Partnership	110.6	107.4
Dividends to common and common equivalent shareholders	(25.5)	(19.0)
Repurchase of common stock	(0.8)	0
Net cash provided by (used in) financing activities	(96.8)	69.9
Net change in cash and cash equivalents	28.2	36.4
Cash and cash equivalents, beginning of period	66.7	76.3
Cash and cash equivalents, end of period	$ 94.9	$ 112.7