Debt (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	7 Months Ended		1 Months Ended				1 Months Ended				1 Months Ended
	Jun. 30, 2013	Dec. 31, 2011 facility	Dec. 31, 2012	May 31, 2011 Revolving credit facility Y	Jun. 30, 2013 Revolving credit facility	Dec. 31, 2012 Revolving credit facility	May 13, 2011 Revolving credit facility	May 31, 2011 Term loan A Y	Jun. 30, 2013 Term loan A	Dec. 31, 2012 Term loan A	May 13, 2011 Term loan A	May 31, 2011 Term loan B Y	Jun. 30, 2013 Term loan B	Dec. 31, 2012 Term loan B	May 13, 2011 Term loan B	Jun. 30, 2013 Senior notes due 2018	Dec. 31, 2012 Senior notes due 2018	Feb. 03, 2010 Senior notes due 2018	Jun. 30, 2013 Senior notes due 2020	Dec. 31, 2012 Senior notes due 2020	Oct. 18, 2010 Senior notes due 2020	Jun. 30, 2013 Senior notes due 2022	Dec. 31, 2012 Senior notes due 2022	Oct. 19, 2012 Senior notes due 2022	Jun. 30, 2013 Other	Dec. 31, 2012 Other	May 13, 2011 Senior Credit Facility
Debt:
Total debt	$ 1,897.1		$ 1,824.8		$ 138.3	$ 34.4			$ 277.1	$ 297.5			$ 75.4	$ 81.0		$ 409.5	$ 410.5		$ 616.7	$ 621.2		$ 291.6	$ 298.9		$ 88.5	$ 81.3
Less current portion and short-term borrowings	(96.2)		(92.8)
Long-term debt	1,800.9		1,732.0
Maximum borrowing capacity under revolving credit facility							500.0																				1,250.0
Number of loan facilities included with the senior credit facility		3
Term of debt (in years)				5				5				6.5
Face amount of debt											$ 350.0				$ 400.0			$ 400.0			$ 600.0			$ 300.0
Weighted-average interest rate, including interest rate caps (as a percent)									3.00%				4.25%
Debt instrument interest rate cap	3.00%
Weighted average interest rate (as a percent)																									6.50%
Derivative, Fixed Interest Rate																			8.31%			5.20%