Acquisitions of Businesses - Purchase Price Allocation (Details) - USD ($) $ in Millions					12 Months Ended
	Jan. 31, 2016	Dec. 01, 2015	Oct. 28, 2015	Feb. 13, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Consideration
Cash, net					$ (1.3)	$ 4,600.3	$ 1,361.8
Acquisition costs					33.4	122.4	47.8
Identifiable assets acquired and liabilities assumed
Goodwill					$ 4,178.9	$ 4,021.9	$ 1,405.3
OMG Malaysia
Consideration
Cash, net	$ (1.3)
Equity instruments	0.0
Note receivable settlement	125.0
Total consideration	123.7
Acquisition costs	0.5
Identifiable assets acquired and liabilities assumed
Accounts receivable - contractual	4.3
- less uncollectible	0.0
Accounts receivable - fair value	4.3
Inventories	6.4
Other current assets	0.2
Property, plant and equipment	4.7
Identifiable intangible assets	43.9
Other assets	0.0
Current liabilities	(3.5)
Non-current deferred tax liability	(11.3)
Other long-term liabilities	0.0
Non-controlling interest	0.0
Total identifiable net assets	44.7
Goodwill	79.0
Total purchase price	$ 123.7
Alent
Consideration
Cash, net		$ 1,507.0
Equity instruments		231.4
Note receivable settlement		0.0
Total consideration		1,738.4
Acquisition costs		29.5
Identifiable assets acquired and liabilities assumed
Accounts receivable - contractual		177.4
- less uncollectible		(1.8)
Accounts receivable - fair value		175.6
Inventories		116.1
Other current assets		33.3
Property, plant and equipment		192.9
Identifiable intangible assets		682.9
Other assets		38.8
Current liabilities		(178.9)
Non-current deferred tax liability		(146.1)
Other long-term liabilities		(331.1)
Non-controlling interest		0.0
Total identifiable net assets		583.5
Goodwill		1,154.9
Total purchase price		$ 1,738.4
OMG
Consideration
Cash, net			$ 239.1
Equity instruments			0.0
Note receivable settlement			0.0
Total consideration			239.1
Acquisition costs			7.4
Identifiable assets acquired and liabilities assumed
Accounts receivable - contractual			33.1
- less uncollectible			(1.6)
Accounts receivable - fair value			31.5
Inventories			13.2
Other current assets			1.6
Property, plant and equipment			35.1
Identifiable intangible assets			77.9
Other assets			0.2
Current liabilities			(21.5)
Non-current deferred tax liability			(16.5)
Other long-term liabilities			(2.9)
Non-controlling interest			0.0
Total identifiable net assets			118.6
Goodwill			120.5
Total purchase price			$ 239.1
Arysta
Consideration
Cash, net				$ 2,856.2
Equity instruments				645.9
Note receivable settlement				0.0
Total consideration				3,502.1
Acquisition costs				30.2
Identifiable assets acquired and liabilities assumed
Accounts receivable - contractual				738.9
- less uncollectible				(51.6)
Accounts receivable - fair value				687.3
Inventories				298.0
Other current assets				126.9
Property, plant and equipment				123.6
Identifiable intangible assets				1,773.0
Other assets				41.0
Current liabilities				(581.2)
Non-current deferred tax liability				(518.4)
Other long-term liabilities				(120.4)
Non-controlling interest				(125.2)
Total identifiable net assets				1,704.6
Goodwill				1,797.5
Total purchase price				$ 3,502.1