Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Assets:
Deferred compensation assets	$ 9.4	$ 8.9
Foreign currency contracts	2.8	0.5
Assets, Fair Value Disclosure	12.2	9.4
Liabilities:
Contingent consideration	5.2	4.9
Deferred compensation liabilities	10.5	9.9
Foreign currency contracts	5.8	5.1
Total liabilities at fair value	21.5	19.9
Level 1 [Member]
Assets:
Deferred compensation assets	9.4	8.9
Assets, Fair Value Disclosure	9.4	8.9
Liabilities:
Deferred compensation liabilities	10.5	9.9
Total liabilities at fair value	10.5	9.9
Level 2 [Member]
Assets:
Foreign currency contracts	2.8	0.5
Assets, Fair Value Disclosure	2.8	0.5
Liabilities:
Foreign currency contracts	5.8	5.1
Total liabilities at fair value	5.8	5.1
Level 3 [Member]
Liabilities:
Contingent consideration	5.2	4.9
Total liabilities at fair value	$ 5.2	$ 4.9