Restructuring Restructuring (Details Textual) - USD ($) $ in Millions	3 Months Ended					12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring charges						$ 0.9	$ 33.1	$ 93.4
2017 Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Total non-recurring operation and capital expenditures	$ 170.0
Redirection of resources	$ 400.0
Restructuring charges						19.4
2016 Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges							17.7
2015 Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Restructuring charges							8.0	93.4
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		(2.3)
Total restructuring charges expected					$ 102.0			$ 102.0
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
Selling, general and administrative | 2017 Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						18.5
Restructuring charges | 2017 Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						$ 0.9