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Contractual Commitments Contingencies and Off-Balance Sheet Arrangements (Narrative) (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Purchase commitments relating to June 30, 2018 $ 483.6
Purchase commitments relating to June 30, 2019 354.7
Purchase commitments relating to June 30, 2020 $ 102.1