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Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Income Taxes (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018
Income Taxes [Line Items]
Federal income tax expense	$ 26.0	$ 8.6
Chaucer [Member]
Income Taxes [Line Items]
Income tax expense (benefit), discontinued operations		4.2
Chaucer [Member] \| Federal [Member]
Income Taxes [Line Items]
Income tax expense (benefit), discontinued operations		5.9
Chaucer [Member] \| Foreign [Member]
Income Taxes [Line Items]
Income tax expense (benefit), discontinued operations		$ (1.7)

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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