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Stock-Based Compensation - Vesting and Deferred Compensation Plan (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock-based compensation expense
Unrecognized compensation cost related to awards other than options	$ 40.3
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards	1 year 9 months 18 days
Stock options
Number of Shares
Outstanding at the beginning of the period (in shares)	1,431,000
Stock options granted (in shares)	1,004,000
Options exercised (in shares)	(345,000)
Options forfeited (in shares)	(126,000)
Outstanding at the end of the period (in shares)	1,964,000	1,431,000
Vested and exercisable at the end of the period (in shares)	844,000
Intrinsic value of options exercised	$ 18.4	$ 8.5	$ 56.4
Fair value of options vested	$ 10.2	$ 5.4	$ 4.7
Weighted Average Price
Outstanding at the beginning of the period (in dollars per share)	$ 81.49
Options granted (in dollars per share)	107.60
Options exercised (in dollars per share)	65.95
Options forfeited (in dollars per share)	105.86
Outstanding at the end of the period (in dollars per share)	95.76	$ 81.49
Vested and exercisable at the end of the period (in dollars per share)	$ 82.86
Weighted average contractual term	7 years 8 months 12 days
The weighted average contractual term of options exercisable	6 years 1 month 6 days
Aggregate intrinsic value of options outstanding	$ 18.0
Aggregate intrinsic value of options vested and exercisable	16.4
Stock-based compensation expense
Unrecognized compensation cost related to awards other than options	$ 14.1
Performance share awards
Vesting period of shares awarded under the Program	3 years
Restricted stock awards
Stock-based compensation expense
Unrecognized compensation cost related to awards other than options	$ 8.0
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards	1 year 7 months 6 days
Performance share awards
Vesting period of shares awarded under the Program	3 years
Fair value of shares vested during year ended December 31	$ 9.8	$ 8.1
Intrinsic value of shares vested during year ended December 31	$ 11.7	$ 11.4
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (shares)	208,000
Awards granted (in shares)	76,000
Awards vested (in shares)	(103,000)
Awards forfeited (in shares)	(12,000)
Outstanding at end of period (shares)	169,000	208,000
Outstanding at beginning of period (in dollars per share)	$ 95.63
Awards granted (in dollars per share)	114.27	$ 106.78	$ 84.73
Awards vested (in dollars per share)	95.05
Awards forfeited (in dollars per share)	109.07
Outstanding at end of period (in dollars per share)	$ 103.47	$ 95.63
Performance share awards
Stock-based compensation expense
Unrecognized compensation cost related to awards other than options	$ 5.6
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards	1 year 8 months 12 days
Performance share awards
Vesting period of shares awarded under the Program	3 years
Fair value of shares vested during year ended December 31	$ 5.2	$ 10.0
Intrinsic value of shares vested during year ended December 31	$ 5.3	$ 11.6
Measurement period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at beginning of period (shares)	160,000
Awards granted (in shares)	54,000
Awards vested (in shares)	(46,000)
Awards converted (withheld) (in shares)	(9,000)
Awards forfeited (in shares)	(6,000)
Outstanding at end of period (shares)	153,000	160,000
Outstanding at beginning of period (in dollars per share)	$ 123.50
Awards granted (in dollars per share)	140.20	$ 141.83	$ 119.08
Awards vested (in dollars per share)	112.82
Awards converted (withheld) (in dollars per share)	108.03
Awards forfeited (in dollars per share)	137.55
Outstanding at end of period (in dollars per share)	$ 132.68	$ 123.50
Weighted average contractual term	9 months 18 days
Aggregate intrinsic value	$ 15.4
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Awards granted (in shares)	13,000	13,000	14,000
Outstanding at beginning of period (in dollars per share)	$ 107.87	$ 83.31
Outstanding at end of period (in dollars per share)	$ 108.72	$ 107.87	$ 83.31
Deferred Compensation Equity
Performance share awards
Number of common stock deferred (in shares)	202,000	281,000

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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No definition available.

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- Definition

Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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No definition available.

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- Definition

Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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No definition available.

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- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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- Definition

Number of share options (or share units) exercised during the current period.

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