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Intangible Assets and Goodwill - Carrying Amount of Intangible Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Acquired contractual rights $ 80.3 $ 74.1
Acquired trademarks 1.2 1.0
Accumulated amortization (54.5) (43.2)
Finite-lived intangible assets, net 27.0 31.9
Goodwill 11.0 10.1
Intangible assets, net $ 38.0 $ 42.0