Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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Basis of Presentation and Recently Issued Accounting Pronouncements - Correction of Errors (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Additional paid-in capital	$ 1,763.1	$ 1,753.3
Selling, general and administrative	(320.6)	(275.2)	$ (267.6)
Direct operating	(721.6)	(655.2)	(713.4)
Restricted cash and cash equivalents	0.0	(7.0)
Net cash used in investing activities	403.0	395.0	389.9
Cash and cash equivalents	$ 41.5	24.0	24.7	$ 28.0
Adjustments \| Historical Mapping of Entities Related to Spin-Off
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Restricted cash and cash equivalents		12.4	(9.0)
Net cash used in investing activities		3.4	(0.1)
Cash and cash equivalents		12.4	9.0	$ 9.1
Adjustments \| Reclassification from Restructuring Expense to Direct Operating Expenses due to Incorrect Mapping [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Restructuring			3.8
Direct operating		3.8	(3.8)
Adjustments \| Reclassification Between SG&A and Direct Operating Expenses due to Incorrect Mapping
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative			5.0
Direct operating		$ 5.0	(5.0)
Impact of Stock Split \| Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Additional paid-in capital			$ 4.3