Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Assets:
Deferred compensation assets	$ 8.3	$ 8.9
Foreign currency contracts	3.7	0.5
Total assets at fair value	12.0	9.4
Liabilities:
Contingent consideration	5.0	4.9
Deferred compensation liabilities	9.4	9.9
Foreign currency contracts	2.4	5.1
Total liabilities at fair value	16.8	19.9
Level 1 [Member]
Assets:
Deferred compensation assets	8.3	8.9
Total assets at fair value	8.3	8.9
Liabilities:
Deferred compensation liabilities	9.4	9.9
Total liabilities at fair value	9.4	9.9
Level 2 [Member]
Assets:
Foreign currency contracts	3.7	0.5
Total assets at fair value	3.7	0.5
Liabilities:
Foreign currency contracts	2.4	5.1
Total liabilities at fair value	2.4	5.1
Level 3 [Member]
Liabilities:
Contingent consideration	5.0	4.9
Total liabilities at fair value	$ 5.0	$ 4.9