Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, at carrying value	$ 1,388.9	$ 187.2
Estimate of Fair Value, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents, at fair value	1,388.9	187.2
Designated as Hedging Instrument [Member] \| Prepaid expenses and other [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	1.0	0.0
Designated as Hedging Instrument [Member] \| Prepaid expenses and other [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	1.0	0.0
Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	0.7	0.0
Designated as Hedging Instrument [Member] \| Other Noncurrent Assets [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	0.7	0.0
Designated as Hedging Instrument [Member] \| Accrued expenses and other [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	7.0	12.3
Designated as Hedging Instrument [Member] \| Accrued expenses and other [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	7.0	12.3
Designated as Hedging Instrument [Member] \| Postretirement benefits and other long-term liabilities [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	2.9	11.4
Designated as Hedging Instrument [Member] \| Postretirement benefits and other long-term liabilities [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	2.9	11.4
Not Designated as Hedging Instrument [Member] \| Prepaid expenses and other [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	3.0	0.0
Not Designated as Hedging Instrument [Member] \| Prepaid expenses and other [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	3.0	0.0
Not Designated as Hedging Instrument [Member] \| Accrued expenses and other [Member] \| Carrying (Reported) Amount, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	0.0	1.4
Not Designated as Hedging Instrument [Member] \| Accrued expenses and other [Member] \| Estimate of Fair Value, Fair Value Disclosure [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Currency forward contracts	$ 0.0	$ 1.4

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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