Summary of Non-cash Operating, Investing and Financing Activities (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of Non-cash Operating, Investing and Financing Activities [Abstract]
Impact on net assets of indemnity settlement with BP Exploration and Production, Inc.	$ 0	$ (82.5)	$ 0
NATCO purchase price allocation adjustment	0	0	(16.9)
Tax benefit of stock compensation plan transactions	11.5	4.9	17.4
Change in fair value of derivatives accounted for as cash flow hedges, net of tax	10.1	(5.2)	(6.1)
Actuarial gain (loss) and impact of plan amendments, net, related to defined benefit pension and postretirement benefit plans	$ (33.3)	$ (7.7)	$ 4.5

Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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+ Details