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Retirement Benefit Plans (Breakdown of amounts in accumulated other comprehensive income expected to be amortized into net periodic benefit cost) (Details) (New) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Retirement Plans [Member]
Prior service cost/(credit)	$ 0
Net actuarial loss/(gain)	2.1
Total	2.1
Medical Plan [Member]
Prior service cost/(credit)	(2.0)
Net actuarial loss/(gain)	0.3
Total	$ (1.7)

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

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- Definition

The aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

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