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Investments (Schedule of Fixed Maturities) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	$ 5,972.4	$ 5,021.6
Fair Value	6,108.6	5,382.7
Investments in Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	5,972.4	5,021.6
Gross unrealized gains	222.7	380.6
Gross unrealized loss	86.5	19.5
Fair Value	6,108.6	5,382.7
U.S. Government and Government Agencies and Authorities
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	876.5	542.7
Gross unrealized gains	10.8	19.6
Gross unrealized loss	28.4	6.2
Fair Value	858.9	556.1
States and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	1,485.6	1,595.5
Gross unrealized gains	62.5	108.6
Gross unrealized loss	14.6	2.3
Fair Value	1,533.5	1,701.8
Foreign Governments
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	6.2	3.0
Gross unrealized gains	0.0	0.2
Gross unrealized loss	0.5	0.0
Fair Value	5.7	3.2
Bonds and Notes
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	3,118.9	2,745.8
Gross unrealized gains	145.5	245.8
Gross unrealized loss	41.9	11.0
Fair Value	3,222.5	2,980.6
Redeemable Preferred Stocks
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities		0.1
Gross unrealized gains		0.0
Gross unrealized loss		0.0
Fair Value		0.1
Collateralized Loan Obligations
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	470.2	134.1
Gross unrealized gains	2.9	5.7
Gross unrealized loss	1.0	0.0
Fair Value	472.1	139.8
Other Mortgage- and Asset-backed
Debt Securities, Available-for-sale [Line Items]
Investments in Fixed Maturities	15.0	0.4
Gross unrealized gains	1.0	0.7
Gross unrealized loss	0.1	0.0
Fair Value	$ 15.9	$ 1.1

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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