Defined Benefit Pension Plans and Other Post-Employment Benefit Plans - Net Period Benefit Costs Charged to Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Total income included in discontinued operations	$ (2.2)	$ (0.5)
Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Total income included in discontinued operations		(0.2)
Defined benefit pension plans | Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Total income included in discontinued operations		(0.2)
Other employee benefit plans | Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Total income included in discontinued operations		$ 0.0