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Self-Insured Risks - Changes in Self-insurance Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Insurance [Abstract]
Balance at beginning of period, gross	$ 171.4	$ 142.1	$ 134.3
Less: Reinsurance receivables	(41.4)	(26.6)	(26.0)
Balance at beginning of period, net	130.0	115.5	108.3
Increase for the provision of current year claims	44.7	43.5	37.1
Decrease for the provision of prior year claims	(3.0)	(0.1)	(4.6)
Expenses related to discontinued operations	(0.5)	(0.4)	(0.5)
Payments related to current year claims	(5.0)	(5.0)	(4.7)
Payments related to prior year claims	(35.1)	(23.5)	(22.5)
Acquisitions	0.0	0.0	2.4
Balance at end of period, net	131.1	130.0	115.5
Add: Reinsurance receivables	39.9	41.4	26.6
Balance at end of period, gross	$ 171.0	$ 171.4	$ 142.1

X

- Definition

Liability for Unpaid Claims and Claims Adjustment Expense, Discontinued Operations

+ References

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- Definition

The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

+ References

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Amount of increase (decrease) in the cost of settling unpaid claims after deduction of reinsurance recoveries related to the acquisition of a business. Includes, but is not limited to, claims which have been incurred but not reported.

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Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs.

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Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs.

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Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims.

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Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer.

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Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs.

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