Fair Value of Assets and Liabilities - Fair Value Measurements (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Transfers Between Levels Amount	$ 0.0
Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Total	24.9	$ 53.3
Fair value liabilities measured on recurring basis
Total	13.0	13.0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Total	19.8	39.8
Fair value liabilities measured on recurring basis
Total	6.7	6.3
Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Total	5.1	13.5
Fair value liabilities measured on recurring basis
Total	6.3	6.7
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Fair value of investment assets	13.1	33.5
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Fair value of investment assets	13.1	33.5
Short-term investments \| Certificates of deposit \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Fair value of investment assets	0.0	0.0
Securities and other investments \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Derivative Asset	0.6	4.8
Securities and other investments \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Derivative Asset	0.0	0.0
Securities and other investments \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Derivative Asset	0.6	4.8
Securities and other investments \| Assets held in rabbi trusts [Member] \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Assets held in rabbi trusts	6.7	6.3
Securities and other investments \| Assets held in rabbi trusts [Member] \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Assets held in rabbi trusts	0.0	0.0
Other current assets \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Derivative Asset	1.8	3.4
Other current assets \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Derivative Asset	0.0	0.0
Other current assets \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Derivative Asset	1.8	3.4
Other current assets \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member]
Fair value assets measured on recurring basis
Derivative Asset	2.7	5.3
Other current assets \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Derivative Asset	0.0	0.0
Other current assets \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value assets measured on recurring basis
Derivative Asset	2.7	5.3
Other current liabilities \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	2.6	3.1
Other current liabilities \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	0.0	0.0
Other current liabilities \| Foreign exchange forward contracts \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	2.6	3.1
Other current liabilities \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	3.7	3.6
Other current liabilities \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	0.0	0.0
Other current liabilities \| Interest rate swaps \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value liabilities measured on recurring basis
Derivative Liability	3.7	3.6
Other liabilities \| Fair Value, Measurements, Recurring [Member]
Fair value liabilities measured on recurring basis
Deferred compensation	6.7	6.3
Other liabilities \| Fair Value, Measurements, Recurring [Member] \| Level 2 [Member]
Fair value liabilities measured on recurring basis
Deferred compensation	0.0	0.0
Other liabilities \| Assets held in rabbi trusts [Member] \| Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value assets measured on recurring basis
Assets held in rabbi trusts	$ 6.7	$ 6.3

Fair value of assets held under trust.

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Fair value of obligations measured on a recurring basis.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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