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Commitments, Guarantees, Indemnifications, and Legal Proceedings - Schedule of Purchase Commitments (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2018 $ 79.8
2019 54.4
2020 45.6
2021 43.0
2022 42.5
Thereafter 159.0
Total $ 424.3