Commitments and Contingencies Other Commitments (Details) $ in Millions	Dec. 31, 2016 USD ($)
Long-term Purchase Commitment [Line Items]
Unrecorded Unconditional Purchase Obligation, Due in Next Twelve Months	$ 130.7
Unrecorded Unconditional Purchase Obligation, Due within Two Years	111.9
Unrecorded Unconditional Purchase Obligation, Due within Three Years	104.5
Unrecorded Unconditional Purchase Obligation, Due within Four Years	87.8
Unrecorded Unconditional Purchase Obligation, Due within Five Years	51.0
Unrecorded Unconditional Purchase Obligation, Due after Five Years	$ 207.8