Debt and Financing Arrangements (Details) - USD ($) $ in Millions	Apr. 01, 2020	Mar. 31, 2020	Dec. 31, 2019
Subsequent Event
Line of Credit Facility [Line Items]
Outstanding borrowings	$ 367.5
Available borrowings	22.4
Proceeds from revolving credit facility	200.0
Outstanding letters of credit	$ 10.1
Unsecured Local Credit Facilities
Line of Credit Facility [Line Items]
Weighted average interest rate		2.09%	2.29%
Available borrowings		$ 52.8
Other short-term borrowings, outstanding borrowings		9.8	$ 3.8
Revolving credit facility
Line of Credit Facility [Line Items]
Outstanding borrowings		$ 165.0	$ 50.3
Weighted average interest rate		2.25%	3.54%
Available borrowings		$ 225.3
Revolving credit facility | Letters of credit
Line of Credit Facility [Line Items]
Outstanding borrowings		9.7
Letters of credit
Line of Credit Facility [Line Items]
Outstanding borrowings		13.3	$ 14.8
Line of credit secured		10.2	11.6
Maximum commitment		$ 59.7	$ 59.8