Fair Value of Financial Instruments (Details) (USD $) In Millions	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Assets: [Abstract]
Short-term investments	$ 15.4	$ 0.6
Deferred compensation assets	3.6	3.6
Commodity contracts	1.1
Total assets at fair value	20.1	4.2
Liabilities: [Abstract]
Contingent consideration liability	1.7	2.3
Deferred compensation liabilities	5.3	5.4
Foreign currency contracts	1.2
Interest rate swap contracts	6.8	6.1
Total liabilities at fair value	15.0	13.8
Level 3 Fair Value Measurements [Roll Forward]
Beginning Balance	2.3
Increase in fair value recorded in earnings	0.1
Reduction in fair value recorded in earnings	(0.8)
Changes in foreign currency exchange rates	0.1
Ending Balance	1.7
Other Financial Instruments [Abstract]
Fair value of long-term debt	361.4	344.2
Carrying amount of long-term debt	367.2	358.1
Level 1 [Member]
Assets: [Abstract]
Short-term investments	15.4	0.6
Deferred compensation assets	3.6	3.6
Total assets at fair value	19.0	4.2
Liabilities: [Abstract]
Deferred compensation liabilities	5.3	5.4
Total liabilities at fair value	5.3	5.4
Level 2 [Member]
Assets: [Abstract]
Commodity contracts	1.1
Total assets at fair value	1.1
Liabilities: [Abstract]
Foreign currency contracts	1.2
Interest rate swap contracts	6.8	6.1
Total liabilities at fair value	8.0	6.1
Level 3 [Member]
Liabilities: [Abstract]
Contingent consideration liability	1.7	2.3
Total liabilities at fair value	$ 1.7	$ 2.3