Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current Assets and Current Liabilities [Abstract]
Threshold for components of total current assets and current liabilities to be presented as an individual caption on Consolidated Balance Sheet (in hundredths)	5.00%
Environmental Costs [Abstract]
Environmental reserves - current portion	$ 5.8	$ 8.1
Restricted Cash [Abstract]
Restricted cash	$ 15.9	0.0
Minimum [Member]
Derivative Instruments [Abstract]
Expected offset percentage of change in fair value derivative instrument (in hundredths)	80.00%
Maximum [Member]
Derivative Instruments [Abstract]
Expected offset percentage of change in fair value derivative instrument (in hundredths)	125.00%
Allowance for Doubtful Accounts, Current [Member]
Movement in valuation allowances and reserves [Roll Forward]
Balance at beginning of period	$ 13.9	7.5	$ 13.2
Charged to costs and expenses	0.8	8.4	2.1
Deductions	(2.6)	(2.0)	(7.8)
Balance at end of period	12.1	13.9	7.5
Reserve for Environmental Costs [Member]
Movement in valuation allowances and reserves [Roll Forward]
Balance at beginning of period	15.6	9.9	13.7
Charged to costs and expenses	6.4	11.9	3.9
Acquisition-related additions and other	1.1	2.5	0.7
Deductions	(10.1)	(8.7)	(8.4)
Balance at end of period	$ 13.0	$ 15.6	$ 9.9
Minor Investment [Member] \| Minimum [Member]
Consolidation Policy [Abstract]
Equity method of ownership interest (in hundredths)	3.00%
Minor Investment [Member] \| Maximum [Member]
Consolidation Policy [Abstract]
Equity method of ownership interest (in hundredths)	50.00%
Major Investment [Member] \| Minimum [Member]
Consolidation Policy [Abstract]
Equity method of ownership interest (in hundredths)	20.00%
Major Investment [Member] \| Maximum [Member]
Consolidation Policy [Abstract]
Equity method of ownership interest (in hundredths)	50.00%

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The current cash, cash equivalents and investments that are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. Includes current cash equivalents and investments that are similarly restricted as to withdrawal, usage or disposal.

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Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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