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Investments - Cost, Gross Unrealized Gains and Losses, and Estimated Fair Value of Available for Sale Investments in Fixed Income Maturities, Short-Term Investments and Equities (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Statement [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	$ 5,177.2	$ 5,387.9
Gross Unrealized Gains	54.0	26.3
Gross Unrealized Losses	(29.8)	(77.9)
Fair Market Value	5,201.4	5,336.3
Total fixed income securities — Available for sale
Statement [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	5,016.5	5,282.3
Gross Unrealized Gains	53.8	26.3
Gross Unrealized Losses	(29.8)	(77.9)
Fair Market Value	5,040.5	5,230.7
Total short-term investments — Available for sale
Statement [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	160.7	105.6
Gross Unrealized Gains	0.2	0.0
Gross Unrealized Losses	0.0	0.0
Fair Market Value	160.9	105.6
U.S. government
Statement [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	1,352.6	1,413.5
Gross Unrealized Gains	14.6	6.8
Gross Unrealized Losses	(8.0)	(16.1)
Fair Market Value	1,359.2	1,404.2
U.S. agency
Statement [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	39.3	47.7
Gross Unrealized Gains	0.3	0.1
Gross Unrealized Losses	(0.1)	(0.4)
Fair Market Value	39.5	47.4
Municipal
Statement [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	46.5	46.7
Gross Unrealized Gains	1.9	1.3
Gross Unrealized Losses	(0.2)	(0.8)
Fair Market Value	48.2	47.2
Corporate
Statement [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	2,151.6	2,238.9
Gross Unrealized Gains	21.8	7.8
Gross Unrealized Losses	(10.8)	(40.5)
Fair Market Value	2,162.6	2,206.2
Non-U.S. government-backed corporate
Statement [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	98.1	93.2
Gross Unrealized Gains	0.4	0.2
Gross Unrealized Losses	(0.2)	(0.2)
Fair Market Value	98.3	93.2
Non-U.S. government
Statement [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	356.9	399.8
Gross Unrealized Gains	4.9	3.6
Gross Unrealized Losses	(0.2)	(0.8)
Fair Market Value	361.6	402.6
Asset-backed
Statement [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	16.2	17.4
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	(0.1)
Fair Market Value	16.1	17.3
Agency mortgage-backed
Statement [Line Items]
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost	955.3	1,025.1
Gross Unrealized Gains	9.9	6.5
Gross Unrealized Losses	(10.2)	(19.0)
Fair Market Value	$ 955.0	$ 1,012.6

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- Definition

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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