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Retirement Benefits - Schedule of Net Benefit Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]
Service cost	$ 0.4		$ 0.4		$ 1.1		$ 1.3
Interest cost	0.8		0.5		1.9		1.5
Expected return on plan assets	(0.8)		(0.6)		(2.1)		(1.8)
Amortization of actuarial losses(a)	0.1	[1]	0.3	[1]	0.3	[1]	0.8	[1]
Net periodic pension cost	$ 0.5		$ 0.6		$ 1.2		$ 1.8
[1] Reflects amounts reclassified from accumulated other comprehensive income (loss) to net income.

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

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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.

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

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-SubTopic 30

-Glossary Expected Return on Plan Assets

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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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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.

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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.

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