Fair Value of Financial Instruments - Financial assets and liabilities accounted for at fair value on a recurring basis by level within the fair value hierarchy (Details) - Total - Fair value measurement on recurring basis - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivatives assets, current	$ 0.2	$ 0.3
Derivative liabilities, current	6.0	3.5
Non-current derivative liabilities at fair value		0.7
Foreign currency exchange contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivatives assets, current	0.2	0.3
Derivative liabilities, current	5.8	1.1
Commodity contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivative liabilities, current	0.2	0.7
Non-current derivative liabilities at fair value		0.1
Interest rate swap contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivative liabilities, current		1.7
Non-current derivative liabilities at fair value		0.6
Level 1
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivatives assets, current	0.0	0.0
Derivative liabilities, current	0.0	0.0
Non-current derivative liabilities at fair value		0.0
Level 1 | Foreign currency exchange contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivatives assets, current	0.0	0.0
Derivative liabilities, current	0.0	0.0
Level 1 | Commodity contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivative liabilities, current	0.0	0.0
Non-current derivative liabilities at fair value		0.0
Level 1 | Interest rate swap contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivative liabilities, current		0.0
Non-current derivative liabilities at fair value		0.0
Level 2
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivatives assets, current	0.2	0.3
Derivative liabilities, current	6.0	3.5
Non-current derivative liabilities at fair value		0.7
Level 2 | Foreign currency exchange contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivatives assets, current	0.2	0.3
Derivative liabilities, current	5.8	1.1
Level 2 | Commodity contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivative liabilities, current	0.2	0.7
Non-current derivative liabilities at fair value		0.1
Level 2 | Interest rate swap contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivative liabilities, current		1.7
Non-current derivative liabilities at fair value		0.6
Level 3
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivatives assets, current	0.0	0.0
Derivative liabilities, current	0.0	0.0
Non-current derivative liabilities at fair value		0.0
Level 3 | Foreign currency exchange contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivatives assets, current	0.0	0.0
Derivative liabilities, current	0.0	0.0
Level 3 | Commodity contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivative liabilities, current	$ 0.0	0.0
Non-current derivative liabilities at fair value		0.0
Level 3 | Interest rate swap contracts
Financial assets and liabilities accounted for at fair value on a recurring basis
Derivative liabilities, current		0.0
Non-current derivative liabilities at fair value		$ 0.0