Retirement Benefits Plans (Cumulative Amounts Not Yet Recognized in Net Income) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan
Cumulative amounts not yet recognized in net income:
Actuarial losses	$ 10.1	$ 16.7
Prior service benefits	0	0
Accumulated other comprehensive loss (income) (before related tax benefit)	10.1	16.7
Postretirement Benefit Plans
Cumulative amounts not yet recognized in net income:
Actuarial losses	11.1	16.5
Prior service benefits	(16.5)	(22.2)
Accumulated other comprehensive loss (income) (before related tax benefit)	$ (5.4)	$ (5.7)

After tax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s).

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant