Other Liabilities (Insurance Reserves) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Self Insurance Reserve
Self insurance reserve, beginning	$ 416.6	$ 431.5	$ 426.4
Additions charged to expense	360.4	354.8	379.1
Payments	(373.1)	(372.2)	(377.2)
Accretion expense	1.9	2.5	3.2
Self insurance reserve, ending	405.8	416.6	431.5
Less: current portion	(127.7)	(118.6)	(136.6)
Long-term portion	$ 278.1	$ 298.0	$ 294.9

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_SelfInsuranceReserve
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant