Restructuring Charges (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended		14 Months Ended
	Jun. 30, 2016	Oct. 31, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2016
Components of the restructuring liability
Current estimate of total charges	$ 8.5
Original estimate of total charges		$ 10.0
Restructuring charges			$ 1.6	$ 0.4	$ 4.5	$ 2.6
Maximum
Restructuring liability
Restructuring expense							$ 7.0
February 2015 Restructuring Plan
Restructuring liability
Provision for restructuring charges					0.2
Cash payments					(0.2)
October 2015 Restructuring Plan
Restructuring liability
Balance at the beginning of the period					0.4
Provision for restructuring charges					4.3
Cash payments					(4.6)
Balance at the end of the period	0.1		0.1		0.1
Severance | October 2015 Restructuring Plan
Restructuring liability
Balance at the beginning of the period					0.4
Provision for restructuring charges					2.1
Cash payments					(2.4)
Balance at the end of the period	$ 0.1		$ 0.1		0.1
Facilities | February 2015 Restructuring Plan
Restructuring liability
Provision for restructuring charges					0.2
Cash payments					(0.2)
Facilities | October 2015 Restructuring Plan
Restructuring liability
Provision for restructuring charges					2.2
Cash payments					$ (2.2)