Restructuring Restructuring (Details Textual) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Adjustments to previous estimates, net						$ (2.3)
Restructuring charges						33.1	$ 93.4	$ 0.0
2015 Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected percentage of positions eliminated					11.00%
Previously accrued incentive compensation					$ 120.0		120.0
Adjustments to previous estimates, net					15.9
Total restructuring charges expected					102.0		$ 102.0
Restructuring charges				$ 9.7	$ 93.4	8.0
2016 Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges						17.7
Cambridge, MA
Restructuring Cost and Reserve [Line Items]
Accelerated depreciation	$ 14.0	$ 15.7	$ 15.8			45.5
Cambridge, MA | 2016 Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges						$ 7.4