Other (Income) Expense, net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Income and Expenses [Abstract]
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component	$ (1.6)	$ (3.5)	$ (4.6)	$ (10.3)
Third-party acquisition-related costs	1.4	0.5	2.7	7.2
Net (gain) loss on sales of investments and disposals of assets	1.0	1.2	2.4	2.5
Currency transaction effects	0.1	0.2	(0.7)	(2.7)
Loss on early extinguishment of debt	0.0	0.0	0.0	4.8
Other miscellaneous (income) expense	(2.0)	(0.7)	(3.0)	(1.2)
Total other (income) expense, net	$ (1.1)	$ (2.3)	$ (3.2)	$ 0.3