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Financial Instruments, Derivatives and Hedging Activities - FV (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Carrying value
Fair value of assets and liabilities
Long-term debt	$ 1.9
Fair value
Fair value of assets and liabilities
Long-term debt	2.0
Fair Value, Measurements, Recurring
Fair value of assets and liabilities
Available for sale securities	12.0	$ 11.0
Derivative assets	23.0	24.0
Derivative liabilities	29.0	26.0
Long-term debt	1,959.0	1,954.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair value of assets and liabilities
Available for sale securities	12.0	11.0
Derivative assets	12.0	4.0
Derivative liabilities	6.0	6.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair value of assets and liabilities
Derivative assets	11.0	20.0
Derivative liabilities	23.0	20.0
Long-term debt	$ 1,959.0	$ 1,954.0

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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