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Summary of Significant Accounting Policies Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Percentage ownership by company	90.00%
Percentage ownership by TDR Capital LLP	10.00%
Provisional tax benefit from remeasurement of deferred tax liabilities		$ 28.1
Provisional tax expense from the deemed repatriation of foreign earnings		$ 2.4
Reclassification from accumulated other comprehensive income to retained earnings from adoption of ASU 2018-02	$ 2.5

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax Benefit

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Tax Cuts and Jobs Act, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense

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Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect

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