Principles Of Consolidation (Estimated Cash Payments) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Workers' Compensation [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
2015	$ 84.7
2016	57.7
2017	40.0
2018	28.6
2019	21.8
Thereafter	106.3
Total	339.1
Property Damage and Liability Claims [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
2015	30.2
2016	18.7
2017	13.2
2018	6.5
2019	3.5
Thereafter	2.9
Total	75.0
Total [Member]
Liability for Claims and Claims Adjustment Expense [Line Items]
2015	114.9
2016	76.4
2017	53.2
2018	35.1
2019	25.3
Thereafter	109.2
Total	$ 414.1