Income Tax Expenses (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Earnings from continuing operations before income taxes	$ 65.3	$ 68.6	$ 114.7	$ 125.9
Income tax expense	$ 17.7	$ 24.9	$ 25.9	$ 46.7
Effective tax rate	27.10%	36.30%	22.60%	37.10%

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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