Goodwill And Indefinite-Lived Intangible Assets Impairment Test Intangible Table (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 39.8	$ 39.8
Finite-Lived Intangible Assets, Accumulated Amortization	22.2	20.6
Finite-Lived Intangible Assets, Net	17.6	19.2
Indefinite-Lived Intangible Assets (Excluding Goodwill)	150.2	150.2
Other intangible assets, net	$ 167.8	$ 169.4