Fair Value Measurements (Fair Value of Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets:
Deferred compensation assets	$ 8.7	$ 8.9
Foreign currency contracts	6.5	0.5
Total assets at fair value	15.2	9.4
Liabilities:
Contingent consideration	1.7	4.9
Deferred compensation liabilities	9.8	9.9
Foreign currency contracts	0.2	5.1
Total liabilities at fair value	11.7	19.9
Level 1 [Member]
Assets:
Deferred compensation assets	8.7	8.9
Total assets at fair value	8.7	8.9
Liabilities:
Deferred compensation liabilities	9.8	9.9
Total liabilities at fair value	9.8	9.9
Level 2 [Member]
Assets:
Foreign currency contracts	6.5	0.5
Total assets at fair value	6.5	0.5
Liabilities:
Foreign currency contracts	0.2	5.1
Total liabilities at fair value	0.2	5.1
Level 3 [Member]
Liabilities:
Contingent consideration	1.7	4.9
Total liabilities at fair value	$ 1.7	$ 4.9