Restructuring, Impairment and Transaction-Related Charges (Schedule of Restructuring Reserves) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Restructuring Reserve [Roll Forward]
Balance, beginning of year	$ 54.2	$ 68.4
Reclassify Canadian restructuring reserves to discontinued operations		(3.6)
Expense from continuing operations	118.3	114.0
Cash payments	(127.2)	(110.1)
Non-cash adjustments	(12.0)	(14.5)
Balance, end of year	33.3	54.2
Employee Terminations [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of year	9.3	24.7
Reclassify Canadian restructuring reserves to discontinued operations		(1.8)
Expense from continuing operations	27.2	29.5
Cash payments	(30.4)	(43.1)
Non-cash adjustments	0	0
Balance, end of year	6.1	9.3
Impairment Charges [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of year	0	0
Reclassify Canadian restructuring reserves to discontinued operations		0
Expense from continuing operations	23.0	13.8
Cash payments	0	0
Non-cash adjustments	(23.0)	(13.8)
Balance, end of year	0	0
Transaction-Related Charges [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of year	0	0
Reclassify Canadian restructuring reserves to discontinued operations		0
Expense from continuing operations	4.1	2.9
Cash payments	(3.2)	(2.9)
Non-cash adjustments	0	0
Balance, end of year	0.9	0
Integration Costs [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of year	18.2	1.1
Reclassify Canadian restructuring reserves to discontinued operations		0
Expense from continuing operations	44.6	45.7
Cash payments	(59.3)	(21.4)
Non-cash adjustments	0	(7.2)
Balance, end of year	3.5	18.2
Other Restructuring Charges [Member]
Restructuring Reserve [Roll Forward]
Balance, beginning of year	26.7	42.6
Reclassify Canadian restructuring reserves to discontinued operations		(1.8)
Expense from continuing operations	19.4	22.1
Cash payments	(34.3)	(42.7)
Non-cash adjustments	11.0	6.5
Balance, end of year	$ 22.8	$ 26.7