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Pensions and Other Postretirement Benefits Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Pensions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service (cost) credit	$ (1.1)	$ (1.9)
Net actuarial (loss) gain	(370.6)	(398.3)
Accumulated other comprehensive income (loss) – pretax	(371.7)	(400.2)
Accumulated other comprehensive income (loss) – net of tax	(226.1)	(248.4)
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service (cost) credit	(0.1)	(0.2)
Net actuarial (loss) gain	4.2	5.5
Accumulated other comprehensive income (loss) – pretax	4.1	5.3
Accumulated other comprehensive income (loss) – net of tax	$ 2.6	$ 3.5

X

- Definition

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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