Fair Value Measurements (Fair Value of Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets:
Short-term investments	$ 7.5	$ 12.4
Deferred compensation assets	5.7	4.0
Total assets at fair value	13.2	16.4
Liabilities:
Contingent consideration	4.3	3.3
Deferred compensation liabilities	12.1	7.6
Interest rate swap contracts	5.6	8.6
Foreign currency contracts		1.4
Total liabilities at fair value	22.0	20.9
Other Financial Instruments [Abstract]
Long-term debt, fair value	365.8	386.0
Long-term debt	371.3	378.8
Level 1 [Member]
Assets:
Short-term investments	7.5	12.4
Deferred compensation assets	5.7	4.0
Total assets at fair value	13.2	16.4
Liabilities:
Deferred compensation liabilities	12.1	7.6
Total liabilities at fair value	12.1	7.6
Level 2 [Member]
Liabilities:
Interest rate swap contracts	5.6	8.6
Foreign currency contracts		1.4
Total liabilities at fair value	5.6	10.0
Level 3 [Member]
Liabilities:
Contingent consideration	4.3	3.3
Total liabilities at fair value	$ 4.3	$ 3.3