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Commitments (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Summary of future minimum payments for noncancelable operating leases, purchase obligations and other liabilities  
Operating Leases, 2017 $ 12.6
Operating Leases, 2018 11.0
Operating Leases, 2019 10.3
Operating Leases, 2020 9.9
Operating Leases, 2021 8.9
Operating Leases, Thereafter 17.3
Totals, Operating Leases 70.0
Purchase Obligations, 2017 182.9
Purchase Obligations, 2018 40.2
Purchase Obligations, 2019 21.9
Purchase Obligations, 2020 18.0
Purchase Obligations, 2021 8.0
Purchase Obligations, Thereafter 0.3
Totals, Purchase Obligations 271.3
Total, 2017 195.5
Total, 2018 51.2
Total, 2019 32.2
Total, 2020 27.9
Total, 2021 16.9
Total, Thereafter 17.6
Totals $ 341.3