Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Other Assets, Noncurrent Disclosure [Abstract]
Deposits	$ 11.4	$ 12.4
Deferred profit sharing asset	11.3	11.3
Income tax receivable	75.4	31.9
Derivative instruments	0.8	1.6
Equity method investment in unconsolidated entities	4.0	3.5
Marketable securities	4.1	4.1
Other	37.9	22.1
Other assets	$ 144.9	$ 86.9