Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets:
Short-term investments		$ 7.5
Deferred compensation assets	6.1	5.7
Foreign currency contracts	0.8
Total assets at fair value	6.9	13.2
Liabilities:
Contingent consideration	5.1	4.3
Deferred compensation liabilities	7.9	7.8
Interest rate swap contracts	4.0	5.6
Foreign currency contracts	0.1
Total liabilities at fair value	17.1	17.7
Level 1 [Member]
Assets:
Short-term investments		7.5
Deferred compensation assets	6.1	5.7
Total assets at fair value	6.1	13.2
Liabilities:
Deferred compensation liabilities	7.9	7.8
Total liabilities at fair value	7.9	7.8
Level 2 [Member]
Assets:
Foreign currency contracts	0.8
Total assets at fair value	0.8
Liabilities:
Interest rate swap contracts	4.0	5.6
Foreign currency contracts	0.1
Total liabilities at fair value	4.1	5.6
Level 3 [Member]
Liabilities:
Contingent consideration	5.1	4.3
Total liabilities at fair value	$ 5.1	$ 4.3