Fair Value of Derivative Instruments and Effect of Such Derivative Instruments on Consolidated Statements of Income and on Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Designated as Hedging Instrument
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Fair Value	$ 9.5		$ 2.8
Liability Derivatives, Fair Value	3.9		5.3
Amount of Gains (Loss) Recognized in OCI	2.9	0
Designated as Hedging Instrument | Foreign Exchange Contract
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gains (Loss) Recognized in OCI	2.5	0.2
Designated as Hedging Instrument | Foreign Exchange Contract | Other Current Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Notional Amount	131.5
Asset Derivatives, Fair Value	5.6		2.8
Designated as Hedging Instrument | Interest Rate Swap | Other Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Notional Amount	300.0
Asset Derivatives, Fair Value	3.9		0
Designated as Hedging Instrument | Interest Rate Swap | Deferred And Other Long Term Liabilities
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Liability Derivatives, Notional Amount	300.0
Liability Derivatives, Fair Value	0		0.9
Designated as Hedging Instrument | Diesel fuel contracts
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gains (Loss) Recognized in OCI	0.4	(0.2)
Designated as Hedging Instrument | Diesel fuel contracts | Accounts Payable and Accrued Liabilities
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Liability Derivatives, Fair Value	3.9		4.4
Liability Derivatives, Notional Amount, Volume	4,400,000
Not Designated as Hedging Instrument
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Fair Value	1.0		2.8
Amount of Gain (Loss) Recognized in Income	3.3	1.0
Not Designated as Hedging Instrument | Foreign Exchange Contract | Other Income (Expense), Net
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in Income	0.9	0
Not Designated as Hedging Instrument | Foreign Exchange Contract | Other Current Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Notional Amount	35.8
Asset Derivatives, Fair Value	0.9		0
Not Designated as Hedging Instrument | Equity derivatives | Selling, General and Administrative Expenses
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Amount of Gain (Loss) Recognized in Income	2.4	1.0
Not Designated as Hedging Instrument | Equity derivatives | Other Current Assets
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Asset Derivatives, Notional Amount	31.7
Asset Derivatives, Fair Value	$ 0.1		$ 2.8