Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Assets:
Deferred compensation assets	$ 8.8	$ 8.9
Foreign currency contracts	3.4	0.5
Total assets at fair value	12.2	9.4
Liabilities:
Contingent consideration	5.0	4.9
Deferred compensation liabilities	9.9	9.9
Foreign currency contracts	8.0	5.1
Total liabilities at fair value	22.9	19.9
Level 1 [Member]
Assets:
Deferred compensation assets	8.8	8.9
Total assets at fair value	8.8	8.9
Liabilities:
Deferred compensation liabilities	9.9	9.9
Total liabilities at fair value	9.9	9.9
Level 2 [Member]
Assets:
Foreign currency contracts	3.4	0.5
Total assets at fair value	3.4	0.5
Liabilities:
Foreign currency contracts	8.0	5.1
Total liabilities at fair value	8.0	5.1
Level 3 [Member]
Liabilities:
Contingent consideration	5.0	4.9
Total liabilities at fair value	$ 5.0	$ 4.9