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Intangible Assets and Goodwill - Carrying Amount of Intangible Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Acquired contractual rights $ 104.1 $ 81.4
Acquired trademarks 1.1 1.2
Accumulated amortization (43.2) (57.8)
Finite-lived intangible assets, net 62.0 24.8
Goodwill 15.3 11.1
Intangible assets, net $ 77.3 $ 35.9