Debt - Outstanding Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
Commercial Paper	$ 113.5	$ 94.5
Short-term loans	100.0	150.0
Current maturities of long-term debt	0.6	0.7
Current capital leases	0.2	0.5
Short-term loans and current maturities of long-term debt	214.3	245.7
Non-current maturities of long-term debt	1.8	2.3
Non-current capital leases	0.2	0.5
Long-term debt and capital leases	2.0	2.8
Total debt and capital leases	$ 216.3	$ 248.5