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Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of accumulated other comprehensive (loss) income (net of related income taxes)
Beginning balance	$ 518.4	$ 682.7	$ 659.6
Other comprehensive loss before reclassifications / adjustments	(1.1)	(0.6)
Retirement benefit plans funded status adjustment	(1.6)	(0.7)	0.6
Net current period change in accumulated other comprehensive loss	(2.7)	(1.3)
Ending balance	500.9	518.4	682.7
Benefit Plans
Components of accumulated other comprehensive (loss) income (net of related income taxes)
Beginning balance	(6.7)	(6.0)
Other comprehensive loss before reclassifications / adjustments	0.1	0.0
Retirement benefit plans funded status adjustment	(1.6)	(0.7)
Net current period change in accumulated other comprehensive loss	(1.5)	(0.7)
Ending balance	(8.2)	(6.7)	(6.0)
Tax benefit associated with benefit plans	2.4	2.1
Currency Translation Adjustments
Components of accumulated other comprehensive (loss) income (net of related income taxes)
Beginning balance	(7.7)	(7.1)
Other comprehensive loss before reclassifications / adjustments	(1.2)	(0.6)
Retirement benefit plans funded status adjustment	0.0	0.0
Net current period change in accumulated other comprehensive loss	(1.2)	(0.6)
Ending balance	(8.9)	(7.7)	(7.1)
Accumulated Other Comprehensive Loss
Components of accumulated other comprehensive (loss) income (net of related income taxes)
Beginning balance	(14.4)	(13.1)	(21.2)
Retirement benefit plans funded status adjustment	(1.6)	(0.7)	0.6
Ending balance	$ (17.1)	$ (14.4)	$ (13.1)

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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