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Retirement Plans (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Defined Benefit Plan Disclosure [Line Items]
Contributions to pension plans	$ 4.7		$ 9.7
Contributions to retiree health care plan	0.4		0.9
Total expected employer contributions in current fiscal year	20.0		20.0
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2.7	2.1	5.3	4.4
Interest cost	3.9	3.5	7.8	7.2
Expected return on assets	(3.9)	(3.3)	(7.7)	(6.7)
Other	0.1	(0.1)	0.2	(0.3)
Net periodic benefit cost	2.8	2.2	5.6	4.6
Retiree Health Care Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0.1	0.1	0.1
Interest cost	0.3	0.4	0.6	0.7
Expected return on assets	0	0	0	0
Other	0	(0.1)	0	(0.1)
Net periodic benefit cost	$ 0.3	$ 0.4	$ 0.7	$ 0.7

X

- Definition

The employer's best estimate, as soon as it can be reasonably determined, of the contributions expected to be paid to the plan in the current fiscal year. This estimate includes actual contributions paid during the reporting period and expected contributions to be paid during the remainder of the current fiscal year. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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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.

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

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This element may be used to encapsulate any other periodic costs associated with defined benefit plans that are not separately disclosed.

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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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-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.

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The amount of cash or cash equivalents contributed during the reporting period by the entity to fund non-pension postretirement benefits.

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The amount of cash or cash equivalents contributed by the entity to fund its pension plans.

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-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.

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