Supplemental Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts
Interest paid	$ 22.7	$ 13.3	$ 7.8
Income taxes paid	38.1	31.9	9.3
Capital spending in accounts payable and accrued liabilities	7.7	8.8	2.6
Business Combination, Consideration Transferred, Other	8.6	0.0	0.0
Allowance for Doubtful Accounts [Member]
Allowance for Doubtful Accounts
Beginning balance	0.8	0.4	0.3
Bad debt expense	0.8	0.4	0.2
Write-offs and discounts	(0.6)	0.0	(0.1)
Currency translation	0.0	0.0	0.0
Ending balance	$ 1.0	$ 0.8	$ 0.4

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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Amount of tangible or intangible assets, including a business or subsidiary of the acquirer transferred by the entity to the former owners of the acquiree. Excludes cash.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase (decrease) in the allowances and reserves, which consist of the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from adjustments.

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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