Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	$ (71.6)
Current-period change	(2.9)
Balance at the end of the period	(74.5)
Deferred tax assets in accumulated other comprehensive loss, pension liabilities	13.6	$ 13.6
Foreign Currency Translation (Loss) Gain
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	(51.1)
Current-period change	(2.9)
Balance at the end of the period	(54.0)
Pension and Postretirement Benefit Adjustments, Net of Tax
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	(20.5)
Balance at the end of the period	$ (20.5)