Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Schedule of accumulated other comprehensive loss
Balance at the beginning of the period	$ (104.7)
Current-period change	16.3
Balance as of June 30, 2017	(88.4)
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	14.0
Balance as of June 30, 2017	(65.9)
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 June 30, 2017	$ (22.5)