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Reinsurance (Schedule of Trust Assets and Reinsurance Liabilities) (Details) - USD ($)
$ in Millions

Mar. 31, 2019

Dec. 31, 2018

Mar. 31, 2018

Dec. 31, 2017

Reinsurance [Line Items]

Restricted cash and cash equivalents

$ 417.9

$ 303.6

$ 368.5

$ 255.6

Restricted securities available for sale

^[1]

62.0

58.6

Accounts payable and accrued liabilities

192.0

186.4

Trust Assets [Member]

Reinsurance [Line Items]

Restricted cash and cash equivalents

1.0

0.3

Restricted securities available for sale

62.0

58.6

Unearned Premium [Member]

Reinsurance [Line Items]

Accounts payable and accrued liabilities

46.9

43.3

Claims Reserve [Member]

Reinsurance [Line Items]

Accounts payable and accrued liabilities

^[2]

$ 1.6

$ 1.6

[1]	Measured at fair value on a recurring basis.
[2]	The claims reserve represents our liability for incurred-but-not-reported claims and is estimated based on historical claims experience.

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