Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Cash Flow, Supplemental Disclosures [Text Block]

Supplemental cash flow information is shown in the below table:

	Year Ended December 31,
	2013			2012	2011
Supplemental Disclosures:	(in millions)
Cash paid for interest, net of capitalized interest	$	156.7		105.1	$	90.5
Cash paid (received) for income taxes	77.9			30.0	(28.5		)
Non-cash investing activities
Change in capital expenditure accrual balance	$	(25.2	)	88.5	$	14.7

Property, Plant and Equipment [Table Text Block]

Buildings	10 to 30 years
Leasehold improvements	3 to 10 years
Service, transportation and field service equipment	3 to 7 years
Furniture and office equipment	3 to 7 years

Components of basic and diluted shares used in EPS

A reconciliation of the components of basic and diluted shares used in the EPS calculation follows:

	December 31,
	2013	2012	2011
	(in millions)
Weighted-average basic common shares outstanding	179.2	177.8	176.5
Potential number of shares issuable under the Long-Term Stock Incentive Plan	0.3	0.9	1.9
Average diluted common shares outstanding	179.5	178.7	178.4