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Retirement Benefits - Schedule of Net Benefit Costs (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost		$ 0.4	$ 0.4	$ 0.9	$ 0.8
Interest cost		0.5	0.4	1.0	0.9
Expected return on plan assets		(0.6)	(0.5)	(1.3)	(1.1)
Amortization of net actuarial losses	[1]	0.1	0.2	0.3	0.3
Net periodic pension cost		$ 0.4	$ 0.5	$ 0.9	$ 0.9
[1] Reflects amounts reclassified from accumulated other comprehensive income to net income.

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
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X

- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

+ References

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

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- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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