Schedule I (Parent Co Statement of Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Revenues	$ 2,556.4	$ 3,069.4	$ 2,709.2	$ 2,436.9	$ 2,319.7	$ 2,517.2	$ 2,226.2	$ 1,961.7	$ 5,146.2	$ 4,188.0	$ 8,215.6	$ 6,705.2	$ 10,771.9	$ 9,024.9	$ 8,299.3
Expenses:
Direct operating		1,539.5	1,414.2	1,358.9	1,257.7	1,238.0	1,194.2	1,115.0	2,773.1	2,309.3	4,312.7	3,547.3	5,752.0	4,806.0	4,573.1
Depreciation of revenue earning equipment and lease charges		674.9	627.5	580.1	550.0	556.7	514.5	508.7	1,207.6	1,023.2	1,882.5	1,579.9	2,525.5	2,128.9	1,896.2
Selling, general and administrative		271.5	280.7	247.4	331.0	204.7	218.4	214.0	528.1	432.3	799.6	637.0	1,021.8	968.0	767.5
Interest expense, net of interest income													667.3	592.9	644.8
Other (income) expense, net		44.8	(1.1)	1.7					0.6		45.4		66.1	35.5	62.5
Total expenses													10,032.7	8,531.3	7,944.1
Income before income taxes	65.2	367.0	219.7	87.4	(29.7)	386.3	160.9	(23.9)	307.1	137.0	674.1	523.3	739.2	493.6	355.2
Benefit for taxes on income		(129.9)	(90.4)	(63.1)	1.0	(134.1)	(65.0)	(24.3)	(153.5)	(89.3)	(283.4)	(223.4)	(345.2)	(222.4)	(137.2)
Equity in earnings of subsidiaries, net of tax													0	0	0
Net income (loss)													394.0	271.2	218.0
Parent
Condensed Financial Statements, Captions [Line Items]
Revenues													4,544.9	4,259.1	4,068.3
Expenses:
Direct operating													2,555.2	2,385.7	2,262.7
Depreciation of revenue earning equipment and lease charges													2,713.6	2,378.5	1,986.2
Selling, general and administrative													482.3	474.1	349.2
Interest expense, net of interest income													336.6	253.5	299.2
Other (income) expense, net													54.1	(10.7)	62.4
Total expenses													6,141.8	5,481.1	4,959.7
Income before income taxes													(1,596.9)	(1,222.0)	(891.4)
Benefit for taxes on income													597.1	477.7	347.3
Equity in earnings of subsidiaries, net of tax													1,393.8	1,015.5	742.5
Net income (loss)													$ 394.0	$ 271.2	$ 198.4