Fair Value Measurements (Fair Value of Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Assets:
Deferred compensation assets	$ 7.4	$ 6.8
Foreign currency contracts	0.2	0.2
Total assets at fair value	7.6	7.0
Liabilities:
Contingent consideration	8.0	6.0
Deferred compensation liabilities	8.4	8.8
Interest rate swap contracts	1.0	2.0
Foreign currency contracts	1.6	0.2
Total liabilities at fair value	19.0	17.0
Other Financial Instruments [Abstract]
Long-term debt, fair value	228.3	225.0
Long-term debt	226.2	228.9
Level 1 [Member]
Assets:
Deferred compensation assets	7.4	6.8
Total assets at fair value	7.4	6.8
Liabilities:
Deferred compensation liabilities	8.4	8.8
Total liabilities at fair value	8.4	8.8
Level 2 [Member]
Assets:
Foreign currency contracts	0.2	0.2
Total assets at fair value	0.2	0.2
Liabilities:
Interest rate swap contracts	1.0	2.0
Foreign currency contracts	1.6	0.2
Total liabilities at fair value	2.6	2.2
Level 3 [Member]
Liabilities:
Contingent consideration	8.0	6.0
Total liabilities at fair value	$ 8.0	$ 6.0