Debt (Details) (USD $) In Millions, unless otherwise specified								0 Months Ended		9 Months Ended
	Dec. 31, 2012 Credit agreement	Sep. 30, 2013 Restated Credit Agreement	Dec. 31, 2012 Restated Credit Agreement	Sep. 30, 2013 Revolving Credit Facility Restated Credit Agreement	Jun. 12, 2013 Revolving Credit Facility Restated Credit Agreement	Jun. 12, 2013 Letter of credit Restated Credit Agreement	Jun. 12, 2013 Swing line loan Restated Credit Agreement	Jun. 12, 2013 Term Loan A Facility Restated Credit Agreement item	Jun. 12, 2013 Incremental Facility Restated Credit Agreement	Sep. 30, 2013 Revolving and Term Loans Restated Credit Agreement Alternate base rate item	Sep. 30, 2013 Revolving and Term Loans Restated Credit Agreement Alternate base rate Minimum	Sep. 30, 2013 Revolving and Term Loans Restated Credit Agreement Alternate base rate Maximum	Sep. 30, 2013 Revolving and Term Loans Restated Credit Agreement Prime rate	Sep. 30, 2013 Revolving and Term Loans Restated Credit Agreement Federal funds rate	Sep. 30, 2013 Revolving and Term Loans Restated Credit Agreement LIBOR item	Sep. 30, 2013 Revolving and Term Loans Restated Credit Agreement LIBOR Minimum	Sep. 30, 2013 Revolving and Term Loans Restated Credit Agreement LIBOR Maximum
Debt
Number of equal consecutive quarterly principal installments								20
Quarterly principal installments								$ 5.0
Maximum borrowing facility					200	25	10	225	75
Variable interest rate base (as a percent)											Alternate Base Rate	Alternate Base Rate	prime rate	federal funds rate	adjusted LIBOR rate for a one-month period	adjusted LIBOR rate (based on one, two, three or six-month interest periods)	adjusted LIBOR rate (based on one, two, three or six-month interest periods)
Percentage points added to the reference rate											0.25%	1.25%		0.50%	1.00%	1.25%	2.25%
Number of fiscal quarters used in calculating the consolidated leverage ratio										4					4
Percentage of the capital stock of Advent's or a guarantor's first-tier foreign subsidiaries serving as collateral on the obligations		66.00%
Leverage ratio, Maximum, Covenant		4.00	2.50
Leverage ratio, Actual		3.29	0.99
Interest coverage ratio, Minimum, Covenant		2.50	3.50
Interest coverage ratio, Actual		20.3	48.8
Liquidity, Minimum, Covenant			50.0
Liquidity, Actual			223.3
Default interest rate (as a percent)		2.00%
Debt outstanding	$ 95.0	$ 350.0		$ 130.0