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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Plan Disclosure [Line Items]
Total expense (income) included in discontinued operations	$ 0.5	$ 2.8	$ 0.2	$ 6.9
Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Total expense (income) included in discontinued operations	0.0	1.3	(0.4)	3.7
Defined benefit pension plans | Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Total expense (income) included in discontinued operations	(0.1)	1.2	(0.5)	3.6
Other employee benefit plans
Defined Benefit Plan Disclosure [Line Items]
Total expense (income) included in discontinued operations	(13.4)	0.1	(13.3)	0.4
Other employee benefit plans | Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Total expense (income) included in discontinued operations	$ 0.1	$ 0.1	$ 0.1	$ 0.1