Other (Income) Expense, net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Other Income and Expenses [Abstract]
Defined benefit pension (income) expense other than service cost	$ (3.4)	$ (3.2)	$ (6.8)	$ (4.4)
Third-party acquisition-related costs	5.8	0.0	6.7	0.0
Loss on early extinguishment of debt	4.8	0.0	4.8	0.0
Currency transaction effects	(2.7)	1.5	(3.1)	2.0
Net (gain) loss on sales of investments and disposals of assets	0.9	0.4	1.3	0.8
Chapter 11 expenses, net	0.5	0.6	1.0	1.5
Business interruption insurance recovery	0.0	(10.6)	0.0	(13.1)
Other miscellaneous (income) expense	(0.1)	(0.1)	(0.4)	(0.1)
Total other (income) expense, net	$ 5.8	$ (11.4)	$ 3.5	$ (13.3)