Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred debt costs	$ 2.1	$ 2.9
Prepayments	18.0	20.0
Intangible assets	25.2	27.8
Other	19.1	22.0
Other assets	$ 64.4	$ 72.7