Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Derivatives - Interest Rate Swaps (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Accumulated other comprehensive loss	$ (2.0)	$ 0.0		$ (2.2)
Interest income (expense) expected to be reclassified out of accumulated other comprehensive income (loss) over the next twelve months	(0.1)
Derivatives
Realized gain (loss) on derivatives	(4.2)	(11.1)	$ 9.4
Interest Rate Swap
Derivatives
Fair value of derivative instrument, liability	0.0
Realized gain (loss) on derivatives	$ 0.0	$ 0.4	$ 3.6