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Pension Plans - Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Net actuarial gain	$ 1.4	$ 1.6
Amortization of net gain	2.7	2.8
Prior service cost	(2.2)	0.0
Amortization of prior service credit	(0.5)	(0.5)
Total recognized in other comprehensive income	1.4	3.9
Total credit recognized in net periodic benefit cost and other comprehensive income	5.4	7.3
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net actuarial loss	(136.4)	(140.5)
Net prior service credit	12.7	15.5
Total included in AOCI not yet recognized in the statement of income	$ (123.7)	$ (125.0)

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Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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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.

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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).

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Amount, before tax, of 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).

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