Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	$ (71.6)
Reclassification of stranded tax effect resulting from Tax Reform to retained earnings	(5.5)
Other current-year change	(25.6)
Balance at the end of the period	(102.7)
Deferred tax assets in accumulated other comprehensive loss, pension liabilities	6.5	$ 13.6
Foreign Currency Translation Loss
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	(51.1)
Other current-year change	(25.7)
Balance at the end of the period	(76.8)
Pension and Postretirement Benefit Adjustments, Net of Tax
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	(20.5)
Reclassification of stranded tax effect resulting from Tax Reform to retained earnings	(5.5)
Other current-year change	0.1
Balance at the end of the period	$ (25.9)