Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Summary of Significant Accounting Policies [Abstract]

Cash Flow, Supplemental Disclosures [Text Block]

Supplemental cash flow information is shown in the below table:

	Year Ended December 31,
	2014		2013			2012
Supplemental Disclosures:	(in millions)
Cash paid for interest, net of capitalized interest	$	163.2	$	156.7		$	105.1
Cash paid for income taxes	0.3		77.9			30.0
Non-cash investing activities
Change in capital expenditure accrual balance	$	8.4	$	(25.2	)	$	88.5

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

	December 31,
	2014	2013	2012
	(in millions)
Weighted-average basic common shares outstanding	179.8	179.2	177.8
Potential number of shares issuable under the Long-Term Stock Incentive Plan	—	0.3	0.9
Average diluted common shares outstanding	179.8	179.5	178.7