Indebtedness (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Jun. 30, 2013	Dec. 31, 2013	Mar. 31, 2013
Debt Instrument [Line Items]
Short-term debt		$ 35.9	$ 30.6
Long-term debt, fair value		139.0	139.0
Line of Credit Facility [Line Items]
Available for future borrowings		213.0
Domestic Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Amount outstanding		0	0
Maximum borrowing capacity	145.0	175.0
Expiration date	Aug. 31, 2014	Aug. 31, 2018
Available for future borrowings		167.0
Variable rate basis		LIBOR
Domestic Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)		1.25%
Domestic Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)		2.25%
Foreign Credit Facility [Member]
Line of Credit Facility [Line Items]
Available for future borrowings		46.0
Domestic Letters of Credit [Member]
Line of Credit Facility [Line Items]
Letters of credit outstanding		8.0
6.8% Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt		$ 125.0
Stated interest rate (in hundredths)		6.80%