Income Tax Expenses (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Earnings from continuing operations before income taxes	$ 80.6	$ 52.8	$ 195.3	$ 178.7
Income tax expense	$ 16.4	$ 15.5	$ 42.3	$ 62.2
Effective tax rate	20.30%	29.40%	21.70%	34.80%

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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