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Commitments and Contingencies - Future Minimum Lease Commitments Under Non-Cancelable Operating Leases (Detail)
$ in Millions
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]  
2019 $ (22.5)
2020 (17.0)
2021 (12.7)
2022 (10.5)
2022 (8.9)
Thereafter (13.2)
Total (84.8)
Minimum lease payments  
Operating Leased Assets [Line Items]  
2019 (23.2)
2020 (17.6)
2021 (13.3)
2022 (11.1)
2022 (9.5)
Thereafter (13.8)
Total (88.5)
Minimum sublease rentals  
Operating Leased Assets [Line Items]  
2019 (0.7)
2020 (0.6)
2021 (0.6)
2022 (0.6)
2022 (0.6)
Thereafter (0.6)
Total $ (3.7)