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Pension and Other Postretirement Benefits - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Pensions
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service (cost) credit	$ (0.7)	$ (0.9)
Net actuarial (loss) gain	(321.9)	(367.3)
Accumulated other comprehensive income (loss) – pretax	(322.6)	(368.2)
Accumulated other comprehensive income (loss) – net of tax	(240.7)	(277.2)
Other Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Prior service (cost) credit	0.0	0.0
Net actuarial (loss) gain	4.2	5.5
Accumulated other comprehensive income (loss) – pretax	4.2	5.5
Accumulated other comprehensive income (loss) – net of tax	$ 2.7	$ 3.7

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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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).

+ References

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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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-Publisher FASB
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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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