Retirement Benefit Plans - Changes in Plan Assets and Benefit Obligations in AOCL (Details) - Foreign Plan [Member] - Pension Plan [Member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in prior service cost recognized in accumulated other comprehensive loss:
Accumulated other comprehensive income at beginning of year	$ 0.5	$ 0.5
Recognized prior service credit	(0.1)	0.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	0.0	0.0	$ 0.1
Total recognized in accumulated other comprehensive income at December 31	$ 4.0	$ 0.5	$ 0.5

Defined Benefit Plan, Change in Plan Assets and Benefit Obligations Recognized in Accumulated Other Comprehensive Income (Loss) [Roll Forward]

No definition available.

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- Definition

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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- Definition

Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income from prior service cost (credit) of defined benefit plan.

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- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees.

+ References

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