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Commitments and Contingencies (Minimum Lease Obligations) (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Future minimum lease obligations under non-cancelable operating leases  
2017 $ 34.7
2018 32.2
2019 29.6
2020 27.3
2021 25.1
Thereafter 85.5
Total $ 234.4