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		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Total (income) expense included in discontinued operations	$ (0.1)	$ 1.9	$ (0.3)	$ 4.1
Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Total (income) expense included in discontinued operations	(0.2)	1.2	(0.4)	2.4
Defined benefit pension plans | Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Total (income) expense included in discontinued operations	(0.2)	1.2	(0.4)	2.4
Other employee benefit plans
Defined Benefit Plan Disclosure [Line Items]
Total (income) expense included in discontinued operations	0.1	0.2	0.1	0.3
Other employee benefit plans | Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Total (income) expense included in discontinued operations	$ 0.0	$ 0.0	$ 0.0	$ 0.0