Goodwill And Indefinite-Lived Intangible Assets Impairment Test Intangible Table (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 40.0	$ 39.8
Finite-Lived Intangible Assets, Accumulated Amortization	23.7	20.6
Finite-Lived Intangible Assets, Net	16.3	19.2
Indefinite-Lived Intangible Assets (Excluding Goodwill)	150.2	150.2
Other intangible assets, net	$ 166.5	$ 169.4