Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	$ (104.7)
Current-period change	26.8
Balance as of September 30, 2017	(77.9)
Deferred tax assets in accumulated other comprehensive loss, pension liabilities	13.5	$ 14.9
Foreign Currency Translation (Loss) Gain
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	(79.9)
Current-period change	24.5
Balance as of September 30, 2017	(55.4)
Pension and Postretirement Benefit Adjustments, Net of Tax
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	(24.8)
Current-period change	2.3
Balance as of September 30, 2017	$ (22.5)