Pensions and Postretirement Benefits Other Than Pensions (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Weighted average assumptions used to determine net periodic benefit cost
Defined benefit plan health care cost trend rate assumed for next fiscal year	7.50%	7.30%	7.50%	7.30%
Defined benefit plan ultimate health care cost trend rate	5.00%	5.00%	5.00%	5.00%
Defined benefit plan year that rate reaches ultimate trend rate	2017	2015	2017	2015
Other Postretirement Benefit Plans Defined Benefit [Member]
Net periodic postretirement benefit cost for other than pensions
Service cost	$ 0.2	$ 0.2	$ 0.5	$ 0.6
Interest cost	3.7	4.4	7.9	8.7
Amortization of prior service cost	(0.3)	(0.1)	(0.3)	(0.1)
Amortization of actuarial (gain) loss	0		0
Net periodic benefit cost	$ 3.6	$ 4.5	$ 8.1	$ 9.2
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	5.29%	5.55%	5.29%	5.55%

The amount of gains or losses recognized in net periodic benefit cost.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

+ References

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-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
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- Definition

The interest rate used to adjust for the time value of money.

+ References

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- Definition

The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

+ References

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Health Care Cost Trend Rate
-URI http://asc.fasb.org/extlink&oid=6514820

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6525008

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-Publisher FASB
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- Definition

The ultimate trend rate for health care costs.

+ References

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The year when the ultimate health care cost trend rate is expected to be reached.

+ References

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